distinguish between human contact and inanimate contact

I’m designing a new game that involves 2 players kicking a ball at a target on the ground.

This electronic scorekeeper needs the ability to identify when the target is contacted by the ball (not a foot or other body part).

The electronic scorekeeper should score a point when the ball contacts the target.

The electronic scorekeeper should not score a point if only a foot, or body part, contacts the target.

The target will be stepped on and abused in the course of the game. The target will get wet/dirty. The target must be low-profile or soft so that it does not injure a player when they step on it. Currently the target is made out of plastic and foam but other materials are considered. The ball may be leather, rubber, synthetic or comparable material.