What is the dose size of Rohypnol to knock out a 20 year old male, 65kg (140lbs)?

Question

 I want to dose a guy. He is 20year old, around 65kg (140lb) in good physical condition.

I don't want to damage him, just knock him out for a while, so i can search his house carefully without being found out. 

Answer 1

make him smell your girl panties, no need for rohypnol and getting charge for *****.