The overnight mass shooting at a Colorado movie theater has raised many questions pertaining to security at entertainment and public venues.

Appearing on the 1590 WAKR Ray Horner Morning Show, Tim Dimoff, president of SACS Consulting, said he believes security needs to change for places that house large groups of people.

"The historical profiles and the statistics tell us, obviously, the shooters go where there's larger crowds and that's where they can maximize what they want to do, unfortunately," Dimoff said.

A gunman opened fire at a movie theater in Aurora, Colorado early Friday morning. At least 12 people were killed and dozens were injured.

Most places, similar to movie theaters, offer basic security which may include a police officer on duty, according to Dimoff.

"In most cases, movie theaters have the presence of a police officer or security, but they're not aggressively searching people. That may change now."

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To keep safety as a top priority, Dimoff suggests placing more security near the entrance of various venues.

"I think the key to this isn't so much after they're in, it's before they come in and while they're coming in."

Dimoff said more of a physical security presence is needed to help deter criminals and keep an eye out for people who bring large bags and objects into buildings.