American Bio Medica, one of Columbia County’s largest manufacturers, is fighting the federal government’s attempt to expand its regulation of the company’s products. The company makes drug testing kits for workplaces and government agencies. The FDA wants to begin regulating saliva drug testing kits, which make up about 20 percent of American Bio Medica’s product line. Chris Gibson, the Republican candidate for the 20th Congressional District seat, touring the plant on Smith Street Thursday, told the company’s assembled workforce this was “capricious legislation.” “Twenty percent of your company’s business is at risk,” he said. The saliva tests make up about...