DR. CURT E. HARPER
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Drug Facilitated Sexual Assault (DFSA)

​Uncovering the hidden role of drugs and alcohol in sexual assault cases
Drug-Facilitated Sexual Assault (DFSA) refers to situations where alcohol or drugs are used to incapacitate a person, making them vulnerable to sexual assault. Substances commonly involved include alcohol, benzodiazepines, GHB, ketamine, and other sedatives - many of which can cause drowsiness, confusion, or memory loss, leaving victims unable to consent or recall events clearly.

Toxicological analysis is critical in DFSA cases because many of these drugs leave the body quickly and can be difficult to detect without prompt testing. Biological samples such as urine, blood, or hair may be analyzed to determine whether incapacitating substances were present. Timing, collection methods, and chain-of-custody are crucial to ensure results are accurate and admissible in court.
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DFSA investigations often arise in criminal prosecutions, civil lawsuits, and university disciplinary hearings. Because these casesinvolve both legal and medical complexities, forensic toxicology provides key scientific evidence that helps establish whether a victim’s account is consistent with drug or alcohol exposure.
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