These days a criminal record is no bar for any computer-related thing...or at least it shouldn't be. However, it'd be prudent to monitor what they're keeping. Anyone who's any good will be keeping little nuggets of stuff for the future.
Their crime is, within the last 2 years, commiting corporate espionage? What in the world are you talking about - that is the literal definition of "should not be working with classified documents and every American's SSN".
These days a criminal record is no bar for any computer-related thing...or at least it shouldn't be. However, it'd be prudent to monitor what they're keeping. Anyone who's any good will be keeping little nuggets of stuff for the future.