This guy should have never spoken to them. Period. Arrest me, give me a lawyer or let me walk out the door. No other words should have escaped his lips.
That's the theoretically noble thing to do. In reality he felt he had nothing to hide and laid it all out for them to see. Perhaps he figured it would be less of a nuisance than obtaining a lawyer and getting yelled at by the wife for wasting more money on that Google Glass thing.
Unfortunately, the cops are on the clock. They're getting paid to waste time. So trying to "save some time" really doesn't work.