They don't. When bringing a laptop in for service, you either give them your password and admin access or you let them wipe your hard drive. Assuming your drive

They don't. When bringing a laptop in for service, you either give them your password and admin access or you let them wipe your hard drive. Assuming your drive is encrypted, of course. The latter seems a lot more acceptable in light of this article as I'm sure Best Buy employees are not the only ones getting kickbacks from the FBI.