WiebeTech's "Hot Plug" is a device that allows cops — and data-thieves — to unplug a computer from the wall without powering it down, preventing the machine from locking down the drives with crypto. Basically, you unscrew the wall-socket (or the power-strip), attach HotPlug (a UPS) to the power-wires, then cut the wires out of the wall — HotPlug keeps the juice running.
Connect HotPlug LT to the computer's power source. There are several ways to achieve this. It's easiest if the target computer is on a Power Strip. If it's not, use Plug Capture Device, or one of the advanced methods to gain access to the computer's supply of power.
(via Schneier)