Observe And Report (2009)

Ronnie Barnhardt (Seth Rogen) is the head of security at the Forest Ridge Mall. He patrols the area with an iron fist where he combats shoplifters and the unruly customers, while at the same time he dreams to be able to swap his small time security job for a badge and a gun as a real police officer. However, his dreams are quickly put to a test when a flasher unexpectedly invades the mall where innocent females become his prey. Meanwhile, Detective Harrison (Ray Liotta) is hunting down the pervert who is terrorizing the women. Soon Ronnie finds himself seizing the opportunity to capture the criminal before the cops get their hands on the wanted pervert.