[prof. burke]when you're really only covered for this. or how you figured you were covered for this. when you're actually paying for this. you might be surprised at what's hiding in your coverage. talk to farmers and get smarter about your insurance. ♪ we are farmers bum-pa-dum, bum-bum-bum-bum ♪ [announcer] call 1-800-farmers and see how much you could save. tonight we have the disturbing results of the year-long investigation into people hired to protect, who end up killing. you see them everywhere as security guards, banks, malls, public facilities. nobody keeps track of how many have guns. the numbers are increasing in recent years. now an investigation for the center of investigative reporting finds a troubling pattern, uneven training and standards for background checks leading to in some cases deadly consequences. we're talked about armed guards with mental issues, those prohibited from having weapons but becomes one of the country's