[lelio]

Also check which way you insert the key. If its on top (that is, you can look down and see the keyhole) then it can be taken off by either the wearer or a person that puts it on him.

If, however, the keyhole is only on the bottom side that probably means me put it on as it wouldn't be that easy to take off by another person. Unless, of course, that person wasn't planning on taking it off.

[lelio]

that probably means me put it on

Er, that should be "probably means he [ the bomb wearer ] put it on" if the keyhole is on the bottom.