Introduction

Forensic science plays a crucial role in the investigation and prosecution of crimes, especially in a country like India, where the justice delivery system faces numerous challenges. Forensic science is the application of scientific knowledge and techniques to obtain evidence needed to solve crimes.

A criminal trial is a formal process in a court of law where a prosecutor representing the government presents evidence before a judge or jury to determine whether an accused person is guilty or innocent. According to Wharton’s Law Lexicon, a “trial” means “the examination of a cause, civil or criminal, before a judge who has jurisdiction over it according to the laws of the land.” A trial, therefore, is a judicial examination of issues between the parties, whether of law or fact.

Scientific evidence often plays a key role in trials and can mean the difference between conviction and acquittal. The collection, preservation, and analysis of evidence are crucial for any successful criminal investigation. Indeed, if proper procedure is not followed and the evidence surrounding the crime is not accurately collected, preserved, and analysed, the entire investigation can be jeopardized. The scientific analysis of evidence left at a crime scene—such as blood, semen, fragments of clothing, hair, weapons, tyre treads, and other physical materials—can be as compelling to a judge as the testimony of eyewitnesses.

Forensic science (often shortened to “forensics”) is the application of a wide spectrum of scientific disciplines to answer questions of interest to the legal system. This may relate to criminal or civil actions. The use of the term “forensics” in place of “forensic science” is technically incorrect; the term “forensic” is actually synonymous with “legal” or “pertaining to courts” (derived from the Latin term meaning “before the forum”). However, because of its long association with the scientific field, many dictionaries now recognize “forensics” as synonymous with “forensic science.”

The evolution and development of society in the modern world have led to a continuous increase in the rate of crimes. In addition, the rise of cybercrimes in recent years has further complicated criminal cases. Thus, although traditional evidence such as oral testimony, documentary evidence, and physical evidence (weapons, clothing, samples, fingerprints) continues to hold great importance in criminal trials, these are often insufficient to ensure complete justice in modern society. The importance of digital evidence has become increasingly significant in contemporary justice systems.

Forensic evidence now bridges the gap between the crime scene and the courtroom, as well as between science and law. Over time, the importance of forensic evidence has widened in criminal investigations and trials. The Indian government has also recognized its significance, embracing it through reforms and amendments in existing laws and regulations.

Although forensic science has proved to be a major breakthrough in the criminal justice realm, its integration is not without challenges and obstacles. The major challenges include lack of infrastructure, shortage of forensic experts, tampering of evidence, and procedural lapses. Therefore, various legislative, administrative, and institutional reforms are required to effectively incorporate forensic science into the criminal justice system to ensure faster, efficient, and fair trials.

Historical Background and Evolution

Global Context

The field of forensic science is not new to society; it has existed since ancient times. Several pieces of evidence suggest the use of fingerprints in early rock carvings and paintings by prehistoric people. It was around the 700s that fingerprints were first used in China to verify the authenticity of documents and clay sculptures, although no standardized system existed at that time.

In 1248, the Chinese text Xi Yuan Lu (The Washing Away of Wrongs), written by Song Ci, distinguished between accidental deaths and homicides, helping in the determination of causes of death. The earliest sources of forensic techniques can be traced back to the Greek and Roman periods, where considerable knowledge existed about the use, effects, and symptoms of various poisons. This early understanding helped in identifying possible causes of death from the consumption of toxic substances.

In the late 19th century, Anthropometry was introduced by Alphonse Bertillon. This system involved measuring physical characteristics to identify criminals. It was later replaced by fingerprinting, which became a more reliable method of identification. In the 1890s, Francis Galton conducted extensive research on fingerprints, and by the 20th century, fingerprinting had been widely adopted as a dependable method of criminal identification.

A famous example is the case of Will West. On May 1, 1903, an African-American man named Will West entered Leavenworth Prison in the United States. During the admission process, prison clerks took his photographs, physical descriptions, and eleven anthropometric measurements. To their surprise, his details matched those of an already imprisoned individual named William West. Forensic anthropometry played a crucial role in this case by using fingerprinting to differentiate between the two men. The analysis confirmed that although the two shared nearly identical measurements and appearances, their fingerprints were unique—demonstrating the reliability of fingerprinting for criminal identification.

Forensic toxicology was first used in 1836 during a jury trial by Scottish chemist James Marsh, who developed a method to detect arsenic and other poisons in the human body. This technique marked a breakthrough in forensic science. The world’s first crime laboratory was established by Edmond Locard in 1910 in Lyon, France. The first recorded autopsy dates back to 44 BCE, when it was performed to determine the cause of Julius Caesar’s death.

A major revolution in forensic science occurred with the introduction of DNA profiling, first used by Alec Jeffreys in 1986 in the case of two murdered young girls in the English Midlands, which helped identify Colin Pitchfork as the murderer.

The concept of computer crimes was first recognized in 1978 in the United States. This was followed by Canada, which became the first country to pass legislation addressing computer offences in 1983. Digital forensics, also known as computer forensics, has since evolved significantly due to the rapid growth of cybercrimes. It helps in recovering and analyzing electronic evidence to investigate crimes such as data theft, online fraud, and cyber exploitation.

Indian Context

The historical Indian justice system traditionally relied on conventional methods such as witness testimonies and physical evidence to solve crimes. The roots of forensic science in India can be traced to ancient texts like Kautilya’s Arthashastra, which described the use of scientific methods for criminal investigations.

The modernization of forensic science in India largely occurred under British rule in the 19th century, with the establishment of formal institutions and procedures. The first Chemical Examiner’s Laboratory was set up in Madras in 1849 to handle poisoning cases. Later, similar laboratories were established in Calcutta, Agra, and Bombay. The first Forensic Science Laboratory (FSL) was established in Kolkata in 1952.

Sir Edward Richard Henry, a British police officer, introduced fingerprinting as a primary method of criminal identification in India, a development that proved groundbreaking worldwide. In 1897, India became one of the first countries to use fingerprinting in criminal investigations by establishing the first Fingerprint Bureau in Calcutta. In the murder case of Kangali Charan, the suspect was identified using fingerprint evidence—marking a landmark moment in forensic history.

DNA technology was first introduced in India in 1989 during a paternity dispute. Subsequently, India’s first Forensic DNA Typing Laboratory was opened in Kolkata in 1998, marking the beginning of modern DNA-based forensic investigation in the country.

Legal Framework governing Forensic Science in India

Forensic science in India operates under a comprehensive legal framework that ensures scientific evidence is collected, analysed, and presented in accordance with law. This framework is guided by provisions in the Indian Constitution, the Indian Penal Code (IPC), the Criminal Procedure Code (CrPC), and various specific acts that govern criminal investigations.

Constitutional Provisions

The Indian Constitution provides the overarching legal context for the use of forensic evidence. Articles 20, 21, and 22 guarantee protection of life, liberty, and personal rights, ensuring that scientific evidence is used judiciously to uphold justice. Forensic science must comply with these constitutional safeguards to prevent unlawful detention, false accusation, or violation of personal rights.

Bharatiya Nyaya Sanhita (BNS)

The BNSS forms the backbone of criminal law in India, defining criminal acts and prescribing punishments. Various sections of the IPC, such as those relating to murder, sexual offenses, theft, fraud, and poisoning, frequently rely on forensic evidence for prosecution. For example, forensic toxicology helps establish the cause of poisoning, while forensic serology and DNA profiling assist in identifying perpetrators of sexual crimes.

Bharatiya Nagrik Suraksha Sanhita (BNSS)

The BNS governs the procedure for criminal investigations, trials, and evidence presentation. Sections 53 to 57 of the BNS specifically empower authorities to conduct medical examinations, collect samples, and perform autopsies. Forensic laboratories operate under these provisions to provide scientifically validated evidence in criminal cases.

Bharatiya Sakshya Adhiniyam

Bharatiya Sakshya Adhiniyam, plays a pivotal role in determining the admissibility and credibility of forensic evidence in court. It stipulates that scientific evidence, including fingerprint analysis, DNA profiling, ballistic reports, and digital forensic findings, must be presented by qualified experts and adhere to rigorous standards of reliability. Courts in India have increasingly relied on forensic evidence to corroborate eyewitness testimony and establish facts beyond reasonable doubt.

Forensic Science Laboratory Act and Rules

Though India does not have a single dedicated act governing all forensic operations, various state-specific Forensic Science Laboratory (FSL) rules regulate the functioning of forensic laboratories. The Ministry of Home Affairs coordinates the establishment, funding, and staffing of these laboratories. Additionally, the DNA Technology (Use and Application) Regulation Bill, 2018, now in force, regulates the collection, analysis, storage, and use of DNA data in criminal and civil cases, establishing strict legal safeguards to protect citizens’ privacy.

Cyber Laws and Digital Forensics

With the rise of cybercrimes, India enacted the Information Technology Act, 2000, which provides legal recognition for electronic records, digital signatures, and electronic evidence. Sections 65 to 79 of the IT Act detail offenses related to hacking, data theft, and cyber fraud, emphasizing the role of digital forensics in criminal investigations. Digital forensic evidence is now routinely used to track cybercriminals, recover deleted files, and authenticate electronic communications in court.

Judicial Recognition

Indian courts have increasingly recognized the importance of forensic science in establishing the facts of a case. Landmark judgments, such as those involving DNA evidence in rape cases, have reinforced the credibility of forensic methods. Courts have emphasized that forensic evidence must meet standards of scientific validity, accuracy, and chain-of-custody documentation to be admissible.

In summary, India’s legal framework ensures that forensic science operates under strict scientific and legal standards, safeguarding both justice and the rights of citizens. The synergy between forensic laboratories, law enforcement agencies, and the judiciary is critical for maintaining a reliable, scientifically grounded criminal justice system.

Fundamental Principles of Forensic Science

The laws and principles of all the sciences form the bases of Forensic Science. In addition, it has also developed its own principles.

1. Law of Individuality: The law states that every object, natural or man- made, has an individuality, which is not duplicated in any other oved in a crime, has individuality. Hence, the culprit is Unique, his modus operandi is unique, his weapon is unique, evidentiary clues are unique.

2. Principle of Exchange: ‘Whenever two entities come in contact, mutual exchange of traces takes place. This is the principle or law of exchange. It is also known as Locard’s principle. It was first enunciated by the French scientist, Edmond Locard. According to this, mutual exchange of traces takes place between the criminal, the victim and the objects involved in crime.

3. Law of Progressive Change: The law states that ‘Everything changes with the passage of time’. In other words, nothing is permanent – immutable or invariable.

4. Principle of Comparison: ‘Only the likes can be compared’. It is principle of comparison. It emphasises the necessity of providing like samples and specimens for comparison with the questioned items.

5. Principle of analysis: ‘The analysis can be no better than the sample analysed’. Improper sampling and contamination render the best analysis useless. The principle emphasises the necessity of correct sampling and correct packing for effective and reliable results.

6. Law of Probability: The law states that all identifications, definite or indefinite, are made, consciously or unconsciously, on the basis of probability.

7. Principle of Circumstantial Facts: The principle states that ‘Facts do not lie, men can and do’. Hence, highlighting the importance of circumstantial evidence as compared with oral evidence.

Branches of Forensic Science

This multidisciplinary field encompasses several branches, some of which include Forensic Anthropology, Toxicology, Ballistics, Odontology, Entomology, Pathology, Psychology, Digital Forensics etc.

• Forensic Anthropology: It uses various tools and techniques to investigate decomposed, or otherwise unidentified remains to assist the courts in deciding various anthropological problems in criminal cases.

• Forensic Odontology- It is the application of systematically organised knowledge relating to dentition, teeth, changes in them due to age, disease, accident, use or abuse, bite marks, artificial dentures, etc. in criminal investigation and trials to reveal and tackle heinous crimes, sordid criminals and their modus operandi,

• Forensic Toxicology- It is the application of toxicology to aid the examination of deaths, poisoning and drug use in order to solve criminal cases. It also involves examining biological samples such as blood, urine and tissues to identify the toxins, drugs to determine their effect on an individual and determine legal cases.

• Forensic Ballistics- Ballistics is the study of functioning of the firearms- firing, the flight of the bullet, and the effects of different types of ammunitions.

• Forensic Psychology- It is the development and application of the principles of psychology to solving and the handling of legal, judicial and law enforcement problems which have their roots in psychology and its branches. 

• Forensic Entomology- It is the application of knowledge relating to arthropods in the dissemination of justice. It deals with the examination of insects in, on, and around human remains to assist in determination of time or location of death. 

• Digital Forensics- It is the branch of Forensic science which uses digital evidences stored in various digital devices for the identification, preservation, analysis of the information using scientifically approved methods to resolve various cybercrimes for example child pornography and various other criminal cases. 

Forensic Pathology- It is a field in which the principles of medicine and pathology are applied to determine a cause of death or injury in the context of a legal inquiry.

 Role of Forensic Science in solving cases

• Nirbhaya Rape Case

 Mukesh & Anr. v. State for NCT of Delhi & Ors., (2017) 6 SCC 1: In the infamous case of Delhi gang rape 2012, a girl was brutally beaten, gang raped and grievously hurt in a bus. Forensic Science helped in this to identify the criminals with the help of forensic evidence. The DNA fingerprinting technique was the most critical component of the forensic investigation. It helped to establish that the semen and blood samples that were found from the victim’s body, clothes and the bus seats and curtains matched with that of the accused. Also, fingerprint analysis “incontrovertibly prove” the presence of one of the convicts, Vinay Sharma, inside the bus during the crime, hence, helped to identify the guilty. The four adult convicts were executed.

• Sheena Bora Murder Case

In the Sheena bora murder case, Sheena bora a 25-year-old was allegedly strangled by her mother Indrani Mukerjee, her then driver Shyamvar Rai and Indrani’s ex-husband Sanjeev Khanna in April 2012. Her body was burned and dumped in forest. The case came to limelight when the driver, Shyamvar, was arrested in some other case. Forensic science played a key role in solving this case. DNA analysis confirmed the identity of Sheena’s remains, as they matched with Indrani’s DNA. Forensic anthropology revealed that strangulation was the cause of death. Forensic odontology ensured the identity of remains as visible teeth in her photographs were compared to the corresponding teeth on the skull to ensure the exact match. DNA Forensics revealed the actions of the accused, Indrani, after the murder. No final punishments have been given to the accused in the case, as the trial is ongoing and key individuals have been granted bail.

• 2008 Noida Double Murder Case

Dr. Mrs. Nupur Talwar v. State of UP & Anr (2017): The double murder case of Noida 2008 mentions the murder of 13-year-old girl Aarushi Talwar and a 45-year-old man who was a domestic helper. The case remains unresolved due to the improper handling and examination of forensic evidence such as blood-stained pillow and manhandling of DNA evidence, which led to the non-identification of the weapon used in the murder. Rajesh Talwar, the father of girl was the sole suspect but the conviction overturned due to speculations and gaps in evidence. If the forensic evidence had been collected and preserved following the standard procedure, the convict would have been behind the bars.

• Jessica Lal Murder Case

 In the Jessica Lal case, Jessica a 34-year-old woman was killed by Manu Sharma who walked in with his three friends in the bar where Jessica was working and demanded liquor to be served. She refused to give liquor since the bar ran out of the same by then. In anger, Manu fired a .22 calibre pistol, first at the ceiling and then in Lal’s head, killing her on the spot. Ballistic Forensics played vital role in resolving the case. The ballistic experts examined cartridge cases and bullets, that were recovered from the scene and found that it matched to .22 calibre pistol which was linked to Manu Sharma. Bullet impact on the wall and the blood spatter patterns helped confirm the distance of firing and direction of shot with the eyewitness account of Manu Sharma.

• Kolkata Rape and Murder Case, 2024

Nirbhaya Case 2.0 of august 2024 deals with the rape-murder of 31-year-old female junior doctor at R.G. Kar Medical College and Hospital in Kolkata. Her dead body was found in the seminar room. Sanjay Roy, 33-year-old male civic volunteer, was taken into custody under suspicion of committing the crime. The victim’s body went for autopsy in order to determine the cause of death. The result of autopsy was dreadful as it revealed that there were grave wounds in her genital tract, lips, left leg, right hand, ring finger, neck etc. It also showed that marks on her face were caused by fingernails of the culprit. The report also revealed that 1.5 mg of semen was found in the vaginal swab, and the doctors assessed it to be a case of gang rape. The reports were revised again, which mentioned that 1.5g(not mg) was the weight of genitalia sample and not semen. Autopsy, a technique of forensic pathology, was used in this case to collect the evidences, thereby, convicting the real culprit. 

Forensic investigation and role of investigative agencies

Forensic science serves as a pivotal link in criminal trials that bridges the gap between law enforcing agencies and the judiciary. The investigative agencies' role fully depends on Forensic evidences. Their work involves a series of tasks like collection, preservation, observation and analysis of the clue materials found at the crime scene. India has several investigative agencies specialised in various tasks. Central Bureau of Investigation (CBI)- investigating serious crimes, economic offences and corruption; National Investigation Agency (NIA)- offences relating to terrorism and national security); Special Investigation Teams (SITs)- gather evidence and prosecute the guilty in serious and special cases. These work in accordance with Central Forensic Science Laboratories (CFSLs) and State Forensic Science Laboratories (SFSLs) to analyse evidence and provide scientifically-backed conclusions that stand up in court.

The Forensic investigation involves a procedure which needs to be followed so that the forensic evidence is admissible in court without ant scrutiny and leads to successful criminal investigation. The Forensic investigation begins with securing of the crime scene by later responder or police officer to avoid the contamination of the evidences. Thereafter, a detailed examination including photography, note-making, videography, sketching takes place. The evidence so collected is preserved after its documentation to uphold proper chain of custody. Subsequently, the evidence gathered is proceeded for analysis using complex techniques like DNA profiling, fingerprint analysis etc. for comparison with known samples to present them in the esteemed court of law.

Challenges To Forensic Evidence

 The stepping of forensic science becomes crucial in dealing with criminal cases and cybercrimes ensuring just, fair and speedier trial to deliver justice. Forensic science can provide spotless proof in linking the criminal with the crime undeniably in most of the cases, but it has some challenges and problems which need to be taken into consideration.

• Investigative Problems: There are various investigative problems such as increase in the number of investigating officers is not in pace with the increasing crime rate and hence, the investigator is not able to give adequate time for the investigation of the case. Consequently, valuable evidence is wasted. Also, the investigator doesn’t possess adequate updated knowledge and experience due to which he’s unable to collect the clue materials correctly. Moreover, there exists uncertainty about the evidences collected and preserved, that whether they were free from any sort of tampering by the onlookers or by the family members involved in the incident, due to the time gap between the occurrence of crime and collection of the evidences. Additionally, the delay in reporting of the forensic evidence results in delayed justice.

• Legal Hurdles: Although, our Indian legal system recognises the significance of forensic evidence in criminal trials, but still there are various legal challenges regarding its admissibility in the court of law. Even today, judiciary shows its inclination towards traditional evidences such as eye witnesses etc. over scientific evidences. While, Section 39 of the Bharatiya Sakshya Adhiniyam (BSA) allows the expert opinion to be used as evidence in legal proceedings, experts frequently face scrutiny in the courts regarding the reliability of their reports. This is largely because of inconsistencies in evidence collection and preserving procedures, which creates doubts about the credibility of forensic reports.

• Scientific Problems: There has been growing use of science in providing justice in India but it is subject to various obstacles in its implementation.  The proper and systematic presentation of scientific evidence is the very crucial for its acceptance by the courts. However, many forensic reports lack adequate statistical data, which is essential to support findings and enhance their reliability. The absence of such data affects its credibility. There is no quality control mechanism in place to verify the equipment, techniques and data used by the experts in their reports. The standardised use of scientific tools and techniques is important to maintain consistency and reliability in scientific examination of the forensic materials. Moreover, accreditation of the experts and institutions is necessary to minimize the risk of unqualified and corrupted experts and to ensure integrity of forensic evidence in judicial proceedings. Additionally, inadequate infrastructure, outdated laboratories, insufficient funding, and poor facilities hinder the effective use of forensic science in the country.

Comparison between global and Indian forensic practices 

While India has made notable progress in the field of Forensic Science, one can see the difference between Indian and global best Forensic practices. Global countries, like USA and United Kingdom, have greatly invested in the infrastructure by establishing large Forensic laboratories empowered with advanced technologies. On the other hand, India has inadequate infrastructure, obsolete equipment, outdated technologies which leads to inaccurate analysis of the Forensic evidence and further leads to delayed justice. Global Forensic laboratories strictly follow the standardised procedure and accreditation forensic system. Whereas, India lacks the uniform system of accreditation and standardisation leading to non-reliability and inconsistencies in criminal investigations using Forensic evidence.

Worldwide, there are limpid laws that provide the admissibility of forensic evidence and are regarded with reverence in the honourable court of law. Indian legal system largely understands its importance, but still forensic evidence faces questions of credibility due to their improper handling.

The globally developed nations have advanced a lot in the forensic science as they invest large amount of their budget in the development of forensic infrastructure, including laboratories, data-centres, specialised training centres, high-tech systems etc. In contrast, India lacks proper funding which results in shortage of highly skilled professionals, outdated technologies, absence of new innovations etc. 

Recommendations

For closing the existing distance and bringing forensic science practices in par with the other evidences used in criminal trials, there need to be some reforms and changes which include establishing better infrastructure consisting upgraded Forensic laboratories, AI-powered analytical tools, advancement of regional scientific laboratories and utilisation of enhanced, updated scientific techniques. 

There is also the need of trained, highly qualified, updated personnel for better collection, preservation and analysis of forensic evidence. This should be encouraged by organising various academic programs providing skills of practical training, internships and research for increasing the potential growth of Forensic Science in India. There should be an increase in financial funding in order to fulfil the requisite of improved infrastructure and capacity building for the inclusion of forensic evidence in criminal trials.

 Legislature should make legislative reforms by updating Bharatiya Nagarik Suraksha Sanhita (BNSS) and Bharatiya Sakshya Adhiniyam (BSA) to clearly define the admissibility of forensic evidence which will increase its use in criminal investigation and trials. There should be some national accreditation body which would promote the accreditation and standardisation of the procedure of collecting, analysing and reporting forensic evidence, further increasing its uniformity and reliability throughout the country. 

Although, forensic investigations are backed by the state funding, there is an urge to ensure that such services are available for free or at minimal cost at least for underprivileged and marginalised victims- including in private complaints, civil disputes, etc. With the increase in cybercrimes in contemporary societies, there is a need to develop specialised forensic platforms for cybercrime investigation and digital analysis.

Conclusion

Forensic Evidence plays an integral role in Indian legal system. Its inclusion into the justice system has improved the efficacy, reliability of the evidence collection and its examination. Forensic as a science has been playing and is playing to give strength to the efforts in fighting the criminals it also shows the immense potential that the science has to speed up the process of criminal justice administration. Forensic science with its wide range of branches like forensic biology, toxicology, anthropology and ballistics to name a few has proved to be extremely helpful in the criminal investigation and trials in purview of providing speedy, just, fair and efficient delivery of justice to the aggrieved. 

In spite of its great importance in the justice system it faces numerous challenges. Legislative reforms regarding the admissibility of forensic evidence in the court of law, can prove to be essential for building public’s trust in forensic science. For the proper collection, documentation, analysis and presentation of forensic evidence, investigative agencies and forensic experts need to work hand-in-hand. Ultimately, forensic science has the potential to serve as a powerful instrument to uphold justice in India. While, challenges persist, a dedicated and collective approach can open the doors for the development of forensic science to its pinnacle, making sure that it becomes a mainstay of India’s criminal justice system.

References

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•  Alex Samuel & Dr. Swati Parikh, DNA Tests in Criminal Investigation and Paternity Disputes (A Modern Scientific Technique) (Dwivedi & Company, Allahabad, 2009).

• Dr. B.R. Sharma, Forensic Science in Criminal Investigation and Trials (Universal Law Publishing Co. Pvt. Ltd., New Delhi-India, 5th edn., 2024)

• Richard Saferstein and Tiffany Roy, Criminalistics an Introduction to Forensic Science (Pearson, 13th edn.,2021)

• Handar Subhandi Bakhtiar, ‘The Evolution of Scientific Evidence Theory in Criminal Law: A Transformative Insight’ (2024) 7 Media Iuris.

• B Priyanka, Justice under the microscope: Forensic science in the criminal justice system 6 International Journal of Law, Policy and Social Review, 81-86 (2024)

• Dr Shivalingappa S. Angadi and Dr Theju Kumar C, " Development of Forensic Science and Criminal Prosecution in India: Progress, Challenges, and Future Directions" 9 INTERNATIONAL JOURNAL OF NOVEL RESEARCH AND DEVELOPMENT (IJNRD)(2024)

• First use of medical knowledge to solve a crime, availability at: https://share.google/PXFvUAtzRrUnDS2gO (last visited on October 25, 2025)

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