The differential disinhibition effect of marijuana use on violent behavior: a comparison of this effect on a conventional, non-delinquent group versus a delinquent or deviant group.

The following Kaplan/Damphouse hypothesis was tested and cross validated: The use of marijuana either predicts to or has a greater effect on increasing the degree of violent behavior for a group that is low on delinquent behavior, than it does for a group that scores high on these behaviors. For the conventional, non-delinquent sub-group, a higher degree of significant relationship between degree of marijuana use and degree of violent behavior was found, compared to the degree of this type of relationship than was found for either cocaine/crack use, amphetamine use, or tranquilizer/sedative use. For example, for the commission of the offense of Attempted Homicide/Reckless Endangerment: for the conventional, non-delinquent group there was a highly significant relationship to the degree of marijuana use; but there was a non-significant relationship between this type of offense and the degree of use of each of the other types of drugs. Thus, this special disinhibition effect was found only for marijuana, and not for other drugs, regardless of whether they were stimulant types of drugs, or were sedative drugs.