This article presents a case of drug-facilitated sexual assault on a female intoxicated with flunitrazepam. The male assailant added flunitrazepam (1 mg) to the female's soft drink, and had sexual intercourse with her while her consciousness was impaired. The complainant did not recall the events due to benzodiazepine-induced anterograde amnesia. The use of flunitrazepam was uncovered when its major metabolite, 7-amino flunitrazepam, was detected in a urine specimen collected when the complainant attended hospital approximately one day after consuming the adulterated drink.