Example story of course. If someone stole a $15 item in 2008, then takes a polygraph for a government job in 2014, should he tell the truth if asked? If he says yes, will they ask him further questions about it, and can that get him in trouble? I know a lot of people say a polygraph is 100% accurate but many others disagree.
Also, if the person applies for a job, gives fingerprints, and they match the previously unidentified prints to the store where the item was stolen in AFIS, can he still be convicted, or does it "expire" since the crime was 6 years prior?