A government investigation came to a conclusion many travelers have voiced for years: TSA's security screeners should be better trained.

The Department of Homeland Security's Office of Inspector Generalconducted a nine-month audit of TSA training that included visits to eight major airports and interviews with 385 screeners and supervisors. It found instances of screeners being told by managers to sign off on completing training they never took, screeners trying to go through recurrent training in break rooms with co-workers...