“The TSA blog carries constant reports of weapons confiscated from people who forgot to remove them from carry-on bags. But the Homeland Security Red Teams in the 2015 test actively concealed forbidden items just as real criminals and terrorist would. The result was that “TSA agents failed 67 out of 70 tests, with Red Team members repeatedly able to get potential weapons through checkpoints.”
Two years later, a Red Team test at Minneapolis-St. Paul Airport achieved the same 95 percent failure rate to detect explosives, weapons, and illegal drugs. Repeat national tests in 2017 also went badly, “in the ballpark” of an 80 percent failure rate.”