Complaints from residents and workers about BP’s restrictive hiring practices are flooding in -- “They can’t smoke pot anymore. It’s just a part of the culture, all the fishermen do it, but now they have to take drug tests to get the cleanup work. So now they goin’ drinkin’.” The potentially disturbing consequence of BP’s prohibition of marijuana: alcohol abuse and domestic violence. Another lesson: prohibition doesn't necessarily mean less drug use, and legalization won't necessarily mean more, there are substitution effects.