Many companies run background checks while hiring to keep convicted criminals away from sensitive corporate data. Here’s a case where that strategy wouldn’t have worked.

Francis Janosko, a former inmate at the Plymouth County Correctional Facility in Massachusetts, was recently arrested by the FBI for stealing confidential information about the prison’s employees.

While serving his time, Janosko was given access to a computer for legal research. The FBI says he found a way to access blocked parts of the prison’s server.

Allegedly, he stole the Social Security numbers of more than 1,000 current and former prison employees, as well as other data. He faces charges of identity theft and intentional damage to a protected computer. If convicted, he could serve up to 12 more years in jail and pay a fine up to $250,000.

They’ll likely keep him away from confidential prison records this time around.

Tags: hacking, identity theft, prison