Medical Marijuana Business Daily:  “As if the medical marijuana industry needs another challenge.  Last week, we published an exclusive story about a move by the MMJ industry’s primary credit card processor to stop handling Visa and MasterCard transactions made at cannabis centers as of July 1. . . . our sources in the merchant services arena say Visa and MasterCard were behind the decision to sever ties with the MMJ industry . . . . Many cannabis professionals have feared this day was coming since American Express stopped processing dispensary transactions last year. Most dispensaries in the nation will be forced to conduct business solely in cash”