A major problem faced by data forensics professionals and law enforcement was how to confiscate computer systems without running the risk of damaging or losing access to information. It's all well and good if you seize a machine running full-disk encryption while it's online because, by definition, the disk is being transparently decrypted so that the machine can operate. Once you power it down, however, all bets are off because the machine won't boot back up without someone supplying a passphrase to the disk encryption system, and no one with anything shady in mind is going to give up their …