DFSA (Drug-Facilitated Sexual Assault)
Definition
Sexual assault in which a substance is administered without the victim's consent to induce sedation, incapacitation, or amnesia. Most common substances in confirmed DFSA toxicology series are ethanol and benzodiazepines, not GHB, contrary to popular perception.
- Most detected substances
- Ethanol and benzodiazepines
- Common misconception
- GHB assumed dominant, actually rare in confirmed cases
- Key evidence window
- Urine sample collected within 72-120 hours
- Key effect
- Sedation, incapacitation, or anterograde amnesia
Common questions
Why is GHB less commonly detected than expected in DFSA cases?+
GHB clears from blood within hours and urine within about 12 hours, so late reporting or delayed sample collection means it is often gone before testing, even in genuine GHB-facilitated cases. Ethanol and benzodiazepines persist longer and are also more accessible substances, which is why they dominate confirmed toxicology series.
What limits toxicological confirmation in a suspected DFSA case?+
Delayed disclosure is the main limit: many victims do not report for one to several days, by which point short half-life sedatives have been eliminated. Hair analysis can extend the detection window to weeks but cannot pinpoint a single dosing event as precisely as blood or urine.
How does DFSA differ from a sexual assault where the victim was voluntarily intoxicated?+
DFSA specifically involves a substance given without the victim's knowledge or consent to facilitate the assault, whereas voluntary intoxication involves the victim's own choice to drink or use a drug. The legal and investigative focus in DFSA is proving covert administration, not just impairment.
Related terms
- 7-Aminoflunitrazepam
- The primary urinary metabolite of flunitrazepam (Rohypnol), detected by LC-MS/MS in urine for up to 72 hours post-ingestion. The target analyte for...
- Endogenous GHB Threshold
- Normal human blood GHB is 0.5-4 mg/L; urine 1-10 mg/L. Post-mortem fermentation can raise values to 20-50 mg/L. Forensic toxicologists typically use...
- Etizolam
- A thienodiazepine (thiophene ring instead of benzene ring fused to the diazepine) with GABA-A modulation pharmacology equivalent to classical benzodiazepines. Approved in...
- Flubromazolam
- A potent triazolo-benzodiazepine (active at 0.125-1 mg), not internationally scheduled, appearing in DFSA and overdose casework. Not cross-reactive with standard BZD immunoassays....
- GABA-a Receptor
- The main inhibitory ligand-gated ion channel in the CNS; a pentameric alpha-beta-gamma subunit complex that opens its central chloride channel when GABA...
- GBL (Gamma-Butyrolactone)
- A prodrug of GHB spontaneously hydrolysed by blood paraoxonase-1 to GHB within minutes. An industrial solvent; scheduled as Class C in the...
- GHB (Gamma-Hydroxybutyric Acid)
- An endogenous GABA metabolite and short-chain fatty acid; exogenous doses of 1-3 g produce sedation, euphoria, and amnesia. Blood half-life ~20-30 min;...
- Phenobarbital
- A long-acting barbiturate (half-life 80-120 h) listed on the WHO Essential Medicines List as a first-line antiepileptic; Schedule IV under the UN...
- Positive Allosteric Modulation
- Mechanism by which benzodiazepines enhance GABA-A function: they increase the frequency of chloride channel opening in response to GABA without directly activating...