The movement for removal of criminal penalties for possession of marih
uana in the United States provides an important case study of the caus
es and process of decriminalization. Between 1973 and 1978, 11 states
reduced criminal penalties for possession of small amounts of the drug
, but the reform movement was fragile, brief, and limited to a few sta
tes. This case study suggests that reform was driven in part by ''mora
l dissonance'' resulting from the arrest of high-status offenders. Alt
hough public opinion has always been deeply divided on decriminalizati
on of marihuana possession, a narrow ''policy window'' was created in
the 1970s by the expressed concern of political leaders about the effe
ct of arrest on high-status youths and the support of law enforcement
agencies interested in efficient use of limited resources. Even after
the window for reform closed at the end of the 1970s with a shift in n
ational leadership, deep moral ambivalence renders criminalization sym
bolic and police place a low priority on marihuana arrests.