The trial has its genesis in a more than decade-old zoning dispute and a previous civil rights lawsuit involving William Pritts, a feed mill operator who erected a concert stage and an amphitheater on his 147-acre spread. At the August 2009 raid, agents seized 76 bags of marijuana, 20 bags of hallucinogenic mushrooms, small amounts of LSD and hashish and six tanks of nitrous oxide, commonly known as laughing gas, plus drug paraphernalia, much of it from vendors Pritts invited.