The most common drug found in use in incidents of sexual assault is alcohol. In a large number of cases alcohol intake will have occurred. Alcohol created increases vulnerability for making choices that can lead to behaviors that both parties do not want to happen.
Alcohol decreases judgment capabilities and impairs motor skills and judgment.
It increases the risks of making unsafe choices. Alcohol intake DOES NOT however, take away responsibility for the choices of behavior. Other well known drugs used to reduce judgment and impair motor skills are Rohypnol, Gamma Hydroxybutrate and Ketamine. Inducing sex by a woman through the use of these drugs is a crime punishable by law. The federal government has banned rohypnol and the makers of the drug, Hoffman LaRoche are discussing putting a dye into the drug so that any drink it is put into will change color.