WASHINGTON — The Financial Industry Regulatory Authority (FINRA) issued a new Investor Alert called Marijuana Stock Scams to warn investors about potential related scams. Medical marijuana is legal in almost 20 states, and recreational use of the drug was recently legalized in two states. As a result, the cannabis business has been getting a lot of attention – including the attention of scammers. Like many investment scams, pitches for marijuana stocks may arrive in a variety of ways – from faxes to email or text message invitations, to webinars, infomercials, tweets or blog posts.