A pot raid, a trial, an overturned conviction and now an appeal have kept Eric Engstrom's life in a constant state of turmoil since March 2009.Along the way, Engstrom has become an activist for marijuana rights.In the last nine months, Engstrom has been criss-crossing the state as president and co-founder of Union Local 13, whose motto, "Don't Leaf Us Out," describes the efforts to unionize marijuana cultivators, processors and distributors.Union Local 13 is 10 months old, the brainchild of founder Kevin DeLang. It now boasts about 900 members, Engstrom said.Marijuana workers need to unionize, Engstrom argued, pointing out that wages …