Drug Schedule

Originally, rohypnol was on schedule IV, begining in 1984. There are Schedule I, II, III, IV, and V drugs. schedule I being the most likely to be abused and have no known medical use. While Schedule V drugs have little capability of being abused, have medical use, and are regulated but do not need a prescription.

Schedule III Drugs
Schedule III drugs have less potential for abuse or addiction than drugs in the first two schedules and have a currently accepted medical use. Examples of Schedule III drugs include Anabolic steroids, Codeine, Ketamine, Hydrocodone with Aspirin, and Hydrocodone with Acetaminophen. Schedule III drugs may be available with a prescription, but not all pharmacies may carry them. 
Schedule IV Drugs 
Schedule IV drugs have a low potential for abuse, have a currently accepted medical use, has a low chance for addiction or limited addictive properties. Examples of Schedule IV drugs include Valium, Xanax, Phenobarbital, and Rohypnol (commonly known as the "date rape" drug). These drugs may be available with a prescription, but not all pharmacies may carry them.  

After reports of abuse and misuse, In 1995, flunitrazepam, the formal name of Rohypnol, changed from schedule IV to schedule II because it was classified as the most misused benzodiazepines and how common it was in the illegal market of drugs. This was done and researched by the International  Narcotics Control Board. They wanted more record keeping of the drug. More illegal use has occured, and in the late 1990's some states have classified it as a Schedule I drug