People who have ingested Rohypnol, particularly when coupled with alcohol, will have very little, or no recall of events that have transpired. At sufficient doses, amnesia may occur. Sedation occurs 20 to 30 minutes after ingestion with peak effect at one to two hours. Sedation lasts for eight hours after 2 mg's is ingested orally. A single or cross score appears on the other side.
Tablets have no taste and are colorless when diluted.
The tablets are often illegally sold in their original bubble wrap packaging. A urine sample should be taken as soon as possible from the victim. Urine collected after 72 hours from ingestion is unlikely to show presence of Rohypnol. Follow your normal chain of custody. Make sure the urine sample is stored in a liquid-tight container.