Imette St. Guillen's murder led to sweeping changes in the laws that govern New York City nightlife.

Days after Darryl Littlejohn killed the John Jay College student, lawmakers started scratching their heads. The Falls bar bouncer should have never been on the job. He was a convicted felon, and state law forbids felons from working as licensed security.

How did Littlejohn get the job watching the door of a trendy Soho pub? Simple. He was unlicensed, and therefore never had a background check.

"It was just an outrage to all New Yorkers," says City Council Public Safety Chair Peter Vallone, Jr. "It was a call to all of us in public safety to make changes, and in her name, in her memory, we did."

Vallone is one of several city council members who worked to pass "Imette's Law," a series of regulations allowing the city to shut clubs down if their bouncers aren't licensed.

Benny Soto, who manages Cielo, a popular dance club in the Meatpacking District, say the law had an immediate affect on the hiring of bouncers.

"What that whole case has done for nightclubs, is it has forced us to take that part of the business a little more seriously."

Imette's law also requires clubs and bars to have ID scanners to thwart underage drinking and video cameras at entrances and exits.

New York's NightLife Association says crime in and around five borough bars and clubs has dropped since Imette St. Guillen's death. Soon after investigators realized the prime suspect was a bar bouncer with a felony record, police, club owners and politicians held a nightlife summit resulting in standardized safety practices. Bouncers at Cielo have been following the new guidelines for months now.

"If there's a female who's visibly intoxicated, we're just not going to throw her on the street," says Soto. "We're just not going to send her home with the first guy that volunteers."