Let's Be Cops (2014)

Two struggling pals dress as police officers for a costume party and become neighborhood sensations. But when these newly-minted "heroes" get tangled in a real life web of mobsters and dirty detectives, they must put their fake badges on the line.
 
Director:  Luke Greenfield
Writers:  Luke Greenfield, Nicholas Thomas
Stars:  Jake Johnson, Damon Wayans Jr., Rob Riggle