Crime scene cleaning

DEFINITION: Professional cleaning and decontamination of a crime scene, including disposing of biologically or chemically hazardous materials and restoring the site to habitable condition.

SIGNIFICANCE: Crime scene cleaners restore a site after forensic investigators have documented the event, collected evidence, and released the scene. Sometimes, in the course of complete restoration of a crime scene, professional cleaners uncover forensic evidence previously overlooked by investigators.

Police and forensic investigators officially release a crime scene after it has been documented and all victims and evidence have been physically removed. Such a scene, particularly if it was the site of a violent crime or drug-related activity, may then be uninhabitable and unusable until it has been cleaned by specialists. The owners of crime scene locations may hire professional cleaning services to avoid the psychological and emotional impact of cleaning these sites themselves. In addition, crime scenes often pose a hazard of contamination by blood-borne pathogens, microscopic organisms that can cause disease, including hepatitis B, hepatitis C, and human immunodeficiency virus (HIV). In the United States, federal law prohibits employers from exposing workers to blood-borne pathogens unless they have been trained to handle blood; thus commercial enterprises, landlords, and business owners usually hire specialists rather than have their janitorial staff restore crime scenes where blood has been spilled.

Crime scene cleaning is sometimes referred to as biohazard remediation, crime and trauma scene decontamination, or biorecovery. Crime scene cleaners are also called biorecovery technicians or trauma scene practitioners. Technicians in the United States can be trained and certified by occupational groups according to standards set by the US Occupational Safety and Health Administration (OSHA).

Crime scene cleaning involves complete disinfection of floors, walls, ceilings, plumbing, and furniture, where possible, and safe disposal of irretrievably damaged furniture and personal items. Potentially infectious substances—such as bone fragments, blood and other bodily fluids, and human tissue—are isolated, packaged, and disposed of in accordance with state and federal regulations for handling biohazardous material. Workers must receive OSHA-required training, including Bloodborne Pathogens training and, where applicable, Hazardous Waste Operations and Emergency Response (HAZWOPER), to ensure legal compliance and protect worker and public safety. Workers also address visible contamination and notify pest control specialists if larvae, insects, vermin, or other means of vectors are present that could spread pathogens around a site. Any hazardous chemical residues left behind by emergency medical personnel or investigators are completely removed.

Biohazard technicians also clean areas where suicides have occurred or where bodies have decomposed over time, accident scenes, and places damaged by animal waste or remains, mold, water, or fire, odors, and chemicals left behind by illegal drug manufacturing (typically the poisonous substances used to make methamphetamine). Some specialized remediation teams are prepared to respond to bioterrorism, decontaminating areas where disease-bearing bacteria have been deployed. Industry practices emphasize the use of advanced disinfection technologies, hospital-grade disinfectants, and comprehensive personal protective equipment to address contamination beyond visible surfaces.

Beyond surface cleaning, professional crime scene cleaners may encounter bodily fluids and other materials hidden under floors, in plumbing, and underneath or behind installed furnishings. They may therefore find evidence relevant to an investigation that was not immediately apparent to police or forensic investigators. Crime scene cleaners should be trained to avoid disturbing potential evidence and report such findings; otherwise, their thorough cleaning and remediation of a scene will completely destroy any evidence left behind.

Bibliography

Cooperman, Stephanie. Biohazard Technicians: Life on a Trauma Scene Cleanup Crew. Rosen, 2004.

DeBruyn, Jennifer. “‘Out, Damned Spot’: The Art and Science of Forensic Restoration.” The Biochemist, vol. 45, no. 5, 2023, doi:10.1042/bio_2023_141. Accessed 7 Feb. 2026.

Jacobs, Andrew. “Cleaning Needed, in the Worst Way.” The New York Times, 22 Nov. 2005, pp. B1–B6.

Reavill, Gil. Aftermath, Inc.: Cleaning up After CSI Goes Home. Gotham Books, 2007.

“Understanding OSHA and EPA Regulations in Crime Scene Cleanup.” CrimeTech Services, 12 Mar. 2025, www.crimetechservices.com/understanding-osha-and-epa-regulations-in-crime-scene-cleanup/. Accessed 7 Feb. 2026.

“What Crime Scene Cleanup Supplies Do Professionals Use?” Trauma Services, 30 Dec. 2025, www.traumaservices.com/blog/professional-crime-scene-cleanup-supplies/. Accessed 7 Feb. 2026.