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The victim is at a party or bar and has something to drink. The attacker somehow slips a Rohypnol tablet into the liquid - perhaps when the victim turns their head or leaves their drink to go to the bathroom.

About twenty minutes after finishing their drink, the victim begins to feel very disoriented, or "drunk." Victims of Rohypnol have often only had one or two drinks, and they remember feeling much more drunk than they should have been.

The attacker volunteers to escort the "sick" or "drunk" person home. Once out of the public eye, the attacker may take the victim to a hotel, to the victim's home, or to other places.

Several hours later, the victim wakes up feeling very disoriented. They can't remember what happened after they left the party, but they may find evidence that something was done to their body while they were "asleep."

Many victims raped under the influence of Rohypnol are unsure whether or not they were raped, because they have no memory of the event. It can take several days to piece together a story from eyewitness reports.

Rohypnol has been used to rape both men and women.

From research like this, we can reflect such events within our thriller.
http://dawn.thot.net/rohypnol.html