Most computers I've seen on government networks use a smart card to sign in (I'm sure it depends on which government network). Pull the smart card out, and the

Most computers I've seen on government networks use a smart card to sign in (I'm sure it depends on which government network). Pull the smart card out, and the device locks. Most people do a good job of taking the card with them, from what I've seen. Although it can be a pain in the ass when you have to resize windows or enter the card pin ~3 times to get logged back in.