How long does the date rape drug (Ruffies) stay in your blood stream?
Hello!
Take a look at the following website to answer your question in more detail:
http://www.4woman.gov/faq/rohypnol.htm
http://en.wikipedia.org/wiki/Flunitrazepam
http://www.usdoj.gov/dea/pubs/rohypnol/rohypnol.htm
If you're asking how long you can feel the effects, that may last up to 8 hours. If you're asking if it can still be detected, that's a different question, and it could be detected in urine or hair a number of days after the exposure.
I hope this helps.