Configurable triggers such as removal or tampering of the drive, removal of device from a resting GPS point, cellular telephone call, or even a change in temperature will release a "chemical mist" into the drive (not the computer) destroying it layer by layer.
If it's after hours, the on-call physician may suggest you go to the emergency room for an evaluation and removal, especially if you've tried to remove the contact several times or are experiencing eye pain or redness.