It is illegal to have possession or deal with rohypnol in the United States and Canada. Though in Europe and Latin America rohypnol is a sleeping pill which is sold as prescription drug as the drug is a depressant. The drug is smuggled over to here by mail or etc.
     Also there has been incidents in the passed where someone has token rohypnol than sexually assaulted someone. So not only can you have legal issues from taking the drug but the reactions that you do while your on the drug can affect your issues also. You don't know what is really happening while your on the drug so you may do something that you would regularly never do.
     "Drug-Induced Rape Prevention and Punishment Act of 1996" was made to increase federal penalties for jail time if sexual assault occurred. Which means rohypnol was had an increased penalty if used found in possession of it.