Caught in a dragnet

It turned out Gass was flagged because he looks like another driver, not because his image was being used to create a fake identity. His driving privileges were returned but, he alleges in a lawsuit, only after 10 days of bureaucratic wrangling to prove he is who he says he is.

And apparently, he has company. Last year, the facial recognition system picked out more than 1,000 cases that resulted in State Police investigations, officials say. And some of those people are guilty of nothing more than looking like someone else. Not all go through the long process that Gass says he endured, but each must visit the Registry with proof of their identity.

“We send out 1,500 suspension letters every day,’’ said Registrar Rachel Kaprielian, who says the system has been a powerful weapon to fight identity fraud since it was installed in 2006 but that it is not without problems. “There are mistakes that can be made.’’

Neither the Registry nor State Police keep tabs on the number of people wrongly tagged by the system. But Gass estimates in his lawsuit that hundreds might have received revocation notices in error since the system was installed.

“Theoretically this can happen again, depending on the whims of the computer,’’ said his lawyer, William Spallina.

Massachusetts began using the software after receiving a $1.5 million grant from the US Department of Homeland Security as part of an effort to prevent terrorism, reduce fraud, and improve the reliability and accuracy of personal identification documents that states issue.

At least 34 states are using such systems. They help authorities verify a person’s claimed identity and track down people who have multiple licenses under different aliases, such as underage people wanting to buy alcohol, people with previous license suspensions, and people with criminal records trying to evade the law. Lisa Cradit, a spokeswoman for L-1 Identity Solutions, the largest developer of the software, said it can reduce fraud by 80 percent.