Medicinal marijuana sales have been approved in 20 states (plus Washington, D.C.) and recreational use green lighted in Colorado and Washington state. Investors have the munchies for the best weed stocks. Call it spliff dividends. Bruce Bedrick, CEO of marijuana public company Medbox (MDBX) that trades over the counter, discusses whether or not investing in this sector is a prudent move. How can traders filter the duds from the good stuff without impaired judgment?