What Is a Forensic Evidence Kit?
A forensic evidence kit is a collection of materials used during a medical-forensic exam to collect, preserve, and document possible evidence after a sexual assault or other violence-related event.
Some people may hear this called a “rape kit,” but the kit is only one part of the exam. A full medical-forensic exam may also include medical care, history-taking, injury assessment, documentation, safety planning, referrals, and support.
The purpose of the kit is to preserve possible evidence in a careful and standardized way while supporting the patient’s health, safety, and choices.
What Is Inside a Forensic Evidence Kit?
A forensic evidence kit contains supplies that help the examiner collect and package possible biological or trace evidence.
Depending on the patient’s history, timing, consent, and local protocol, the kit may include materials for:
• swabs from areas of the body
• clothing or underwear collection
• fingernail evidence collection
• debris or trace evidence collection
• oral, genital, or external body swabs
• reference samples when appropriate
• documentation forms
• envelopes, bags, labels, and seals
The exact contents of a kit can vary by state, hospital, agency, and type of exam. Not every item in the kit is used for every patient. Evidence collection should be guided by the patient’s history, the time frame, consent, ongoing assent, and local protocol.
The Kit Is Not the Whole Exam
A common misunderstanding is that the evidence kit is the exam. In reality, the kit is one tool used during a larger medical-forensic evaluation.
A medical-forensic exam may include:
• assessing for injuries
• evaluating symptoms and medical concerns
• discussing pregnancy prevention when applicable
• discussing STI testing or preventive medications when appropriate
• documenting the patient’s medical history of the event
• photographing injuries with consent
• collecting evidence when appropriate
• connecting the patient with advocacy and follow-up support
The patient’s medical needs come first. Evidence collection should never replace appropriate healthcare.
Consent and Ongoing Assent
A patient should be informed about each step of the exam before it happens. Consent is required for evidence collection, photographs, medications, and other parts of the evaluation.
Patients may be able to:
• agree to the entire exam
• decline certain parts of the exam
• take breaks
• ask questions
• stop the exam at any time
Consent is an ongoing process. A trauma-informed exam should give the patient as much choice and control as possible throughout the evaluation.
Ongoing assent is also important, especially when caring for children, adolescents, or patients who may have limited decision-making capacity. Assent means the patient is actively willing to participate in the exam, even when a parent, guardian, or legally authorized person is providing formal consent.
A trauma-informed exam should not rely on consent alone if the patient is clearly uncomfortable, resisting, withdrawn, or asking to stop. The patient’s comfort, safety, and emotional response should be continually assessed.
Ongoing assent may include:
• explaining each step in a developmentally appropriate way
• checking in before moving to the next part of the exam
• watching for verbal and nonverbal signs of distress
• allowing breaks when needed
• stopping or delaying parts of the exam when appropriate
• respecting the patient’s boundaries whenever possible
Medical-forensic exams often happen after a loss of control. Seeking ongoing assent helps restore choice, dignity, and trust during the evaluation.
What Happens to the Kit After It Is Collected?
After a forensic evidence kit is collected, it is sealed, labeled, and handled according to chain-of-custody procedures. Chain of custody means there is a documented record of who handled the kit, when it was transferred, and where it went.
What happens next depends on the patient’s reporting choice, age, state law, local policy, and the circumstances of the case.
In some situations, the kit may be transferred to law enforcement. In other situations, it may be stored for a period of time without immediate testing if the patient is not ready to report. Laws and processes vary by state, so patients should receive clear information about their local options.
Does Getting a Kit Mean You Have to Report?
Many adult patients may have options for receiving a medical-forensic exam even if they are not ready to report to law enforcement. However, reporting requirements vary depending on state law, patient age, injuries, vulnerability, or safety concerns.
In Washington State, sexual assault survivors have the right to receive a medical forensic exam at no cost and retain certain rights regardless of whether they participate in the criminal justice system. Washington also has a sexual assault kit tracking system that allows survivors to anonymously track the status and location of their kit.
Cases involving children, vulnerable adults, serious injury, or certain safety concerns may involve mandatory reporting.
A forensic nurse, advocate, or healthcare provider can help explain what options and reporting requirements apply in that specific situation.
When Should Someone Seek Care?
It is generally best to seek care as soon as possible after an assault or violence-related event, especially if the patient is considering evidence collection. Some evidence may be affected by time, bathing, changing clothes, eating, drinking, brushing teeth, or using the bathroom.
However, a person should still seek care even if time has passed, they have showered, or they have changed clothes.
Medical care may still be important for:
• injury assessment
• documentation
• STI concerns
• pregnancy prevention options when applicable
• strangulation symptoms
• safety planning
• emotional support and referrals
It is never wrong to ask for help.
Why Forensic Nurses Are Important
Forensic nurses are specially trained to provide medical care and forensic documentation for patients affected by violence. They understand how to collect evidence carefully while also supporting the patient’s physical and emotional needs.
Forensic nurses are trained to:
• explain the exam process
• obtain informed consent
• assess and document injuries
• collect evidence according to protocol
• maintain chain of custody
• provide trauma-informed care
• connect patients with advocacy and follow-up resources
Their role is not to decide whether something happened. Their role is to provide healthcare, document findings objectively, and support the patient through the medical-forensic process.
Final Thoughts
A forensic evidence kit is an important tool, but it is only one part of a larger medical-forensic exam. The exam should focus on the patient’s health, safety, consent, assent, and choices.
Understanding what a forensic evidence kit is can help reduce fear and misinformation. Patients deserve clear information, compassionate care, and access to trained professionals who understand the medical and forensic needs that may follow sexual assault or violence.
About FERNS
FERNS provides specialized forensic nursing services focused on compassionate, trauma-informed care and accurate medical documentation of violence-related injuries. Our nurses work alongside hospitals, law enforcement, and community partners to support patients and provide high-quality forensic medical evaluations.
Through education and public outreach, FERNS aims to increase awareness of forensic healthcare, reduce misinformation, and improve access to trauma-informed care for patients affected by violence.
Sources
U.S. Department of Justice, Office on Violence Against Women. Sexual Assault Medical Forensic Examination Information.
https://www.justice.gov/ovw/sexual-assault-medical-forensic-examination-safe-information
U.S. Department of Justice, Office on Violence Against Women. A National Protocol for Sexual Assault Medical Forensic Examinations.
https://www.justice.gov/ovw/media/1367191/dl?inline=
SAFEta. Recommendations at a Glance: The Examination Process.
https://www.safeta.org/page/recommendexamprocess/
RAINN. Getting a Sexual Assault Forensic Exam.
https://rainn.org/2240/getting-a-sexual-assault-forensic-exam-safe/
Washington State Legislature. RCW 70.125.110. Rights of Sexual Assault Survivors.
https://app.leg.wa.gov/rcw/default.aspx?cite=70.125.110
Washington State Legislature. WAC 446-95-040. Survivor Tracking of Their Washington Sexual Assault Kit.
https://app.leg.wa.gov/wac/default.aspx?cite=446-95-040