Summary. In “The War on Weed,” Christof Putzel travels coast to coast to investigate the bizarre range of marijuana laws and enforcement in America. In California, legalized medical marijuana has led to something of a free for all and the Feds are cracking down. In Colorado, medical marijuana is protected by the state constitution and millionaire entrepreneurs have set up shop. In New York City, African-American men are arrested by the tens of thousands for low-level pot possession.