I don't see why not... but there's a better way of doing it.

The IRA used to do it in the 70s to Protestants and other people they caught who snitched on them:

- Person stands against a wall
- Drops their pants
- Gun put to the side/front/back of the knee
- Bullet into the kneecap

Not only does it shatter the kneecap, but it also hurts a lot and the victim is lamed for life.

Much more effective.