Homeland Security chief Jeh Johnson said to be 'frustrated' by dismal results
                                
                                
                                    (Newser) -
                                    They're good at finding  dead bears, live snakes , and even  human skulls , but what TSA agents don't find enough of are the fake explosives and weapons that undercover Homeland Security agents tried to smuggle past them. The results were downright dismal: TSA agents failed 67 out of 70...