TCST covers trauma and crime scene cleanup based on S540. Start with the scope boundary: the standard assumes the scene has been released by law enforcement or regulators. Then organize your course notes around investigation, plans, safety, remediation, waste handling and confirmation of cleaning.
What the TCST certification covers
TCST covers the situations encountered in trauma and crime scene cleanup regardless of surface, item, or location, and it is based on the ANSI/IICRC S540 Standard for Trauma and Crime Scene Cleanup.
IICRC describes the certification as demonstrating knowledge of the procedures and precautions used at a trauma or crime scene. A certified technician can inspect and investigate contamination from human blood and other potentially infectious material (OPIM, a formal term for materials that may carry infectious agents) to establish hazard assessments, work plans, and procedures for cleaning and safely transporting contaminated material.
IICRC gives three examples of the work the credential supports: remediating blood and body fluids left at a crime scene after an investigation, cleaning and disposing of biohazard materials from a vehicle after an accident or crime, and cleaning blood and body fluids at an industrial property after a work-related accident. Note that the first example starts after an investigation ends, which leads to an important scope rule below.
The certification sits in IICRC's restoration-track family. It is not required for any IICRC Master Designation, so choose it for the specialty work itself, not as a stepping stone to a master credential.
Sources: TCST – IICRC — Certification overview, prerequisites, and use cases; S540 – IICRC — Standard status, scene-release assumption, component list, edition dates
Scenes must be released before cleanup
The S540 standard assumes every scene has already been released by law enforcement or regulatory agencies before cleanup procedures apply.
The release assumption appears in the published S540 scope. It places the cleanup work described by the standard after the relevant authorities have released the scene. Study this boundary alongside the inspection and work-plan topics in your course.
Sources: S540 – IICRC — Standard status, scene-release assumption, component list, edition dates
Eligibility and course formats
There are no prerequisites for TCST, and IICRC offers it through both live-stream and in-person courses.
No prerequisite certification means no prior IICRC credential is required. You still earn the certification by completing the course and passing the exam, so do not read it as a self-study-only path.
Course availability can vary and is subject to change, so confirm current options in IICRC's certification locator before planning travel. Live-stream seats are capped, attendance is taken daily for the full duration, and missing a day forfeits certification eligibility.
Sources: TCST – IICRC — Certification overview, prerequisites, and use cases; FAQs – IICRC — Live-stream and in-person exam sections: fees, 45-day registration, candidate agreement; Certifications Offered – IICRC — Restoration division list: TCST delivery formats
Exam format and retests
The published passing score is 75%. IICRC allows one initial attempt and up to two retests.
In-person candidates take the exam on the final course day. Candidates completing an available live-stream course use the IICRC Online Exam Portal. Online testing requires a supported desktop or laptop with a camera, microphone and internet connection; check the current portal requirements before testing.
The retest page gives 45 days from receipt of the IICRC Exam Notification. Your notification states your attempts and expiration date. Use that date; the FAQ pages also describe windows tied to course completion or scoring, so those different triggers should not be combined into a new deadline. After two unsuccessful retests, IICRC requires re-enrollment.
The public sources used here do not establish this certification's question count or time limit. Check the exam instructions for those details and confirm the applicable fee when registering.
Sources: FAQs – IICRC — Live-stream and in-person exam sections: fees, 45-day registration, candidate agreement; I Need to Retest – IICRC — Retest attempts, 45-day window, online portal requirements, country pricing note; Retest FAQs – IICRC — 75% passing score, two retests, device requirements, results timing
Topics to prepare, straight from S540
The S540 standard organizes trauma and crime scene cleanup into a defined set of components, and that list is your most reliable preparation map.
The published standard covers the principles of trauma and crime scene cleanup, safety and health, antimicrobial biocide technology, administrative procedures with project documentation and risk management, inspection and preliminary determination, equipment and supplies, and limitations, complexities, complications, and conflicts.
It then covers remediation by context: structural, vehicle and other machinery, and contents remediation. It closes with packaging, transport, and disposal of regulated infectious or potentially infectious waste, and confirmation of cleaning.
Two cautions keep your studying honest. First, the component list describes the standard's scope; it is not a weighted exam blueprint, so do not guess percentages or question counts from it. Second, the abstract is not the full standard. The detailed procedures live in the purchased document, and your approved course walks through them. Use the list to check coverage of your notes, not to reconstruct technical rules.
- Principles of trauma and crime scene cleanup
- Safety and health
- Antimicrobial biocide technology
- Administrative procedures, project documentation, and risk management
- Inspection and preliminary determination
- Equipment and supplies
- Limitations, complexities, complications, and conflicts
- Structural remediation
- Vehicle and other machinery remediation
- Contents remediation
- Packaging, transport, and disposal of regulated infectious or potentially infectious waste
- Confirmation of cleaning
Sources: S540 – IICRC — Standard status, scene-release assumption, component list, edition dates
How the hierarchy of controls shapes decisions
The NIOSH hierarchy ranks elimination, substitution, engineering controls, administrative controls and PPE in that order of preference.
Elimination removes the hazard at the source and is NIOSH's preferred action because no exposure can occur. Substitution swaps in a safer alternative, comparing the new risks against the old. Engineering controls reduce or prevent hazards from reaching workers, for example by modifying equipment or the workspace, using protective barriers, or adding ventilation.
Administrative controls establish work practices that reduce exposure, such as training, job rotation, and limiting access to hazardous areas. Personal protective equipment, such as gloves and respirators, is the final level. NIOSH is explicit that engineering controls are more effective because they work without significant human interaction, and that employers should not rely on PPE alone when other effective options exist.
Use the hierarchy to classify how a proposed control works. A control that changes equipment differs from a rule about how people work, and both differ from equipment worn by the worker. Classification alone does not show that a real work plan is adequate; combinations of controls may be needed.
Practice exercise
In a classroom classification exercise, A is a fixed protective machine guard that prevents contact with a hazard. B is a written rule limiting access to trained staff. C is suitable protective gloves worn by the worker. Classify each control and put these three categories in NIOSH preference order. This question does not ask whether they are sufficient for a particular job.
Show answer
A is an engineering control, B an administrative control and C PPE. The preference order among these categories is A, B, C.
The guard changes the equipment to reduce contact with a hazard. The access rule changes work practices. Gloves are worn protection. NIOSH generally prefers engineering controls over administrative controls and PPE because they can reduce exposure without significant human interaction. This ranking does not remove the need for other effective controls or a site-specific assessment.
Your next steps
Find a course, complete it, and schedule your exam inside the notification window while your course knowledge is fresh.
While you study, check your notes against the S540 component list above and prioritize any area you cannot explain in your own words, especially documentation, waste handling, and confirmation of cleaning. Pair this guide with the practice questions linked below.
- Locate a current TCST course in IICRC's certification locator
- Complete every day of the course; live-stream attendance is taken daily
- Study against the S540 component list and the purchased standard for procedures
- Plan for the monitored online exam setup, or arrange an instructor-sitting for a paper retest
Sources: TCST – IICRC — Certification overview, prerequisites, and use cases; FAQs – IICRC — Live-stream and in-person exam sections: fees, 45-day registration, candidate agreement; I Need to Retest – IICRC — Retest attempts, 45-day window, online portal requirements, country pricing note; S540 – IICRC — Standard status, scene-release assumption, component list, edition dates
Sources
Facts checked September 15, 2026: