introduce this kind of variable. >> reporter: last year the special counsel ordered dhs to investigate brainard's complaints righting, "there is a substantial likelihood that the information provided to osc discloses gross mismanagement and specific danger to public safety." >> my biggest fear is having something happen that costs american lofts, and i didn't step up and put a stop to it at least try because it's going to happen. it's not a question of if, it's a question of when. we are along overdue for another attack. >> reporter: the tsa took action on one of his complaints saying they continued to use an ineffective test to determine if new hires were colorblind, a disqualifying medical condition even after concerns about the test's effectiveness were raised. >> if you had something in the bag and the person were colorblind, they wouldn't see the bottom if it were the only thing in the bag. >> reporter: tsa is using a new test for new hires.