Cassie is at a popular nightclub. She is acting uninhibited but also confused. She may have unwittingly consumed Rohypnol, a benzodiazepine (a class of psychoactive drugs used to treat anxiety and insomnia). Rohypnol is used in the short-term treatment of insomnia, as a pre-medication in surgical procedures (an intermediate-acting benzodiazepine with general properties). Rohypnol causes partial amnesia; individuals are unable to remember certain events that they experience while under the influence of the drug. This effect is particularly dangerous when Rohypnol is used illicitly (sexual assault).