Thanks so much for the read through and the suggestions, Nikita. I will clear up things in those sections you outlined.

Rohypnol is a sleeping pill that causes anterograde amnesia ie you can't remember events that occur under the influence of the drug. It is know as the date-rape drug. It is illegal in the US but legal in Mexico. Is this something that is not commonly known? Do you think that I should change the drug to something more common?