Customers queue outside of Chesapeake Apothecary in White Plains, Maryland, on the first day of legal recreational marijuana sales. More states are legalizing or expanding access to marijuana, but testing and regulations vary widely across the country, raising safety concerns. (Barbara Barrett | Stateline) Amid the growing acceptance and legalization of cannabis use across the … [Read more...] about As more states legalize pot, their uneven safety rules can pose a risk