By: KTVU Staff

Security guards for bars and nightclubs are hired to keep patrons and employees safe, and are supposed to be licensed by California’s Bureau of Security & Investigative Services. But 2 Investigates uncovered an underground industry of unlicensed and untrained guards throughout the state, including in the Bay Area. And experts say it's putting customer and bouncer safety at risk.

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According to security consultants, some entertainment businesses are known to employ unlicensed or under-licensed guards to save money, because training typically comes out the employer’s pocket. However, in doing so, the businesses roll the dice on public safety, experts say.

The highest level of licensing means a full criminal background check and job-specific training, which includes skills to de-escalate situations.

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"It changed everything"

On April 12, 2015, Carlos Garay was in front of Penthouse Club & Restaurant on Broadway in San Francisco.  in San Francisco. He and his brother were drinking when they tried to enter the venue.

2 Investigates obtained surveillance video showing the front door guard refusing the two entry. Garay can be seen approaching the guard when his brother got in between the two men. Video shows Garay trying to confront the bouncer a second time time when a different man, later identified as the bartender, suddenly punched Garay.

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“Last thing I expected was to get assaulted by the workers at the business,” said Garay.

It wasn’t the punch that got local law enforcement involved, but rather what happened next. With Garay down but seemingly still conscious, video shows the bouncer launched forward stomping on Garay’s head.

Read the rest of the story here.