Bloomington, Ind. ? Chris Ludy has heard it all. He’s the “ID Nazi,” the “ID police” — names yelled at him by Indiana University students who’ve tried, unsuccessfully, to use fake IDs at the liquor store he manages a few blocks off campus.

He and his staff at Big Red Liquors use black lights to help them examine holograms on any number of state licenses that come through their doors. They check campus directories to see if students’ addresses match those given on the licenses. And they grill people whose birth dates look doctored — often keeping the IDs they suspect are fake.

“I’ll ask them what their astrological sign is, just to see how they react,” Ludy says.

Now his store and several others near college campuses in Indiana have added one more tool to foil potential underage drinkers: They’re using scanners that read the bar codes and electronic strips on the back of many states’ drivers licenses.

The devices are gaining popularity with liquor retailers, police officers and bar owners nationwide as fake IDs get ever-more sophisticated and difficult to spot.

These days, students can order fake IDs from any number of Web sites or from fellow students, usually for $100 or more. Often, the more expensive fakes have holograms on them to make them appear more real.

“As they get better, we need to get better,” says John Livengood, president of the Indiana Association of Beverage Retailers, which has several members testing the scanning devices for this month’s hard-partying college homecoming weekends.

At Indiana University — ranked by The Princeton Review as one of the nation’s “top party schools” — several students said having a fake ID was considered almost a rite of passage — one that could generally get them into a busy bar, if not a liquor store.

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“Most people I know have fake IDs, and if they don’t, they know where to get them,” said Trisha Brazelton, a 19-year-old sophomore.

Even those who use the scanning system concede that it is not, by itself, the perfect solution.

The IDlogix, a handheld scanner that reads the bar codes and electronic strips on the back of most states' drivers licenses, is displayed on a pile of confiscated IDs in a Bloomington, Ind. liquor store. A growing number of alcohol retailers are adding the scanner as one of the tools to foil underage drinkers.

Some retailers noted that the scanners sometimes didn’t work if a license was bent.

A few states — Alaska, Wyoming, Oklahoma, Tennessee and New Jersey — don’t have bar codes on their licenses, though many have plans to add them. Georgia licenses also have coding that can’t be read by most scanners, Myers says.

And already, some who make fake IDs are adding bar codes that actually work in some basic scanners. (The IDLogix devices used in Indiana are tougher to fool because they can detect when the bar code information is not provided in a particular state’s exact format.)

Before they started using the scanners, employees at the 15-store Big Red Liquors chain in Bloomington still confiscated about 100 fakes a year — some of them downright laughable. One, for example, turned out to be a computer-generated Tennessee look-alike ID stuck atop a hotel key card.

Donna Lattanzio, general manager of the Village Bottle Shoppe liquor stores near Purdue University, is glad to have the scanners as a backup — for one, to help her fend off belligerent students who argue that their IDs are real.

“Not today, pal,” she often tells them.