Forensic science in the United States

Forensic science in the United States
Name	Forensic science in the United States
Established	19th century–present
Jurisdiction	United States

Contents

Forensic science in the United States is the application of scientific techniques and methods to questions of law within the United States judicial and investigative systems. It integrates laboratory analysis, field procedures, and expert testimony to support agencies such as the Federal Bureau of Investigation, Drug Enforcement Administration, Bureau of Alcohol, Tobacco, Firearms and Explosives, United States Marshals Service, and state and local New York City Police Department crime laboratories. Practitioners collaborate with institutions including the National Institute of Standards and Technology, Centers for Disease Control and Prevention, National Institutes of Health, Department of Justice, and academic centers such as Harvard University, Johns Hopkins University, and University of California, Berkeley.

History and development

Forensic practice in the United States evolved from early medico-legal activities connected to figures like Paul Brouardel-era European influence, the work of Alphonse Bertillon techniques mirrored in New York City Police Department record systems, and the establishment of the FBI Laboratory under J. Edgar Hoover and forensic pioneers such as Edmond Locard and Francis Galton whose fingerprint research influenced U.S. adoption. Landmark cases including the Haymarket affair, the Lindbergh kidnapping, and the investigation of the Assassination of President John F. Kennedy stimulated expansion of forensic capacity and legal scrutiny. The rise of DNA technology after work by Alec Jeffreys and implementation in U.S. investigations, notably in cases linked to laboratories like the Orange County Sheriff's Department and institutions such as Cold Spring Harbor Laboratory, transformed identification practices and led to databases like Combined DNA Index System and legislative acts including the DNA Identification Act of 1994.

U.S. forensic practice operates within an array of statutory and judicial standards shaped by cases such as Frye v. United States and Daubert v. Merrell Dow Pharmaceuticals, Inc., and overseen by bodies like the Department of Justice and the Federal Bureau of Investigation. Federal statutes and state laws interact with constitutional protections derived from cases including Miranda v. Arizona and Gideon v. Wainwright, while appellate decisions from the Supreme Court of the United States and circuits such as the United States Court of Appeals for the Ninth Circuit define admissibility and expert testimony standards. Oversight intersects with agencies like the National Institute of Justice and standards organizations such as the American National Standards Institute and professional groups including the American Academy of Forensic Sciences and the International Association for Identification.

Forensic work covers a spectrum from biological analyses (DNA profiling, serology) developed through institutions like Cold Spring Harbor Laboratory and techniques refined by innovators such as Kary Mullis, to latent print examination practiced in units of the FBI Laboratory and municipal labs like the Los Angeles Police Department Scientific Investigation Division. Toxicology labs at facilities such as CDC and university programs at University of Michigan analyze drugs and poisons; ballistics comparison originates from early work by firearms examiners in agencies such as the Bureau of Alcohol, Tobacco, Firearms and Explosives; forensic anthropology draws on collections and expertise from museums like the Smithsonian Institution and universities including University of Tennessee; digital forensics is advanced at centers like Carnegie Mellon University and commercial firms used by New York City Police Department. Disciplines such as questioned document examination, trace evidence (hair, fibers), forensic odontology, fire investigation influenced by National Fire Protection Association, and crime scene reconstruction employ methods validated by organizations such as the National Research Council and standards bodies like the International Organization for Standardization.

Accreditation and quality systems are implemented by entities including the American Society of Crime Laboratory Directors through programs tied to ANSI National Accreditation Board and international schemes like ISO/IEC 17025. Quality assurance initiatives stem from reports by the National Academy of Sciences and audits conducted by the Office of the Inspector General (United States Department of Justice), prompting guidance from the National Institute of Standards and Technology and policy from the National Commission on Forensic Science. Proficiency testing, accreditation of laboratories run by municipal agencies such as the Chicago Police Department, and certification of examiners by groups like the American Board of Criminalistics aim to standardize practice, while professional development often occurs through conferences hosted by the American Academy of Forensic Sciences and training at institutions such as Federal Law Enforcement Training Centers.

Forensic evidence supports prosecutors from offices like the United States Attorney's Office and defenders in state offices such as the Los Angeles County Public Defender, informing investigations by agencies including the Federal Bureau of Investigation and state police like the Texas Department of Public Safety. Forensic reports and expert testimony are presented in courts ranging from municipal courts to the Supreme Court of the United States, impacting verdicts in notable prosecutions such as those heard in the United States District Court for the Southern District of New York and high-profile cases involving institutions like the Manhattan District Attorney's Office. Collaborative initiatives such as multidisciplinary cold case units, combined task forces with the Drug Enforcement Administration, and partnerships with university researchers aim to improve case resolution, wrongful conviction review by innocence projects like the Innocence Project and policy reforms advocated by bodies including the MacArthur Foundation.

The field faces controversies revealed in reports by the National Academy of Sciences and investigations by the United States Department of Justice Office of the Inspector General into errors at labs including municipal and state facilities. High-profile miscarriages involving individuals reviewed by the Innocence Project and judicial scrutiny in cases cited before the Supreme Court of the United States spurred reforms such as accreditation mandates promoted by the National Institute of Justice, legislative responses like the Justice for All Act of 2004, and research funding from agencies including the National Institutes of Health and National Science Foundation. Contemporary challenges include backlogs critiqued in hearings of the United States Congress, disputes over the scientific validity of some pattern evidence following analyses by the National Research Council, workforce shortages addressed by programs at Federal Law Enforcement Training Centers and university forensic programs at Michigan State University, and ethical debates engaged by professional societies such as the American Academy of Forensic Sciences and the International Association for Identification.