By Sean Philip Cotter | [email protected] | Boston Herald PUBLISHED: September 13, 2019 at 8:39 pm | UPDATED: September 13, 2019 at 8:39 pm Two more people have resigned from Boston’s troubled Zoning Board of Appeals after Mayor Martin J. Walsh ruled that they can’t work for the city while continuing to have a stake in pot shops. Both Marie St. Fleur and Bruce Bickerstaff are resigning from the ZBA, city officials confirmed on Friday night. Bickerstaff co-owns Silver Therapeutics, which has been looking to open up a recreational marijuana shop in Roslindale. St. Fleur’s term had expired on July 1, 2018, but she remained a holdover. The former state rep has a stake in Union Twist, which is looking to sell weed in Allston. City officials said they are not aware of any inappropriate actions. Officials said the policy, announced earlier in the day on Friday, is to ensure that no employees or members of boards are in positions that may pose a conflict. This is the latest twist in the saga of a zoning board that’s under independent investigation by a former federal corruption prosecutor following the guilty plea of a BPDA staffer who took bribes to push a project through. Then mayor’s special adviser, William “Buddy” Christopher, also said last week he would step down temporarily to avoid interfering with a probe of the Zoning Board of Appeals.