How Will Sports Handle Players Who Spit On The Field?

Fine, penalty during the game, other? 

This may seem like an easy answer to some - just don't spit.

For others - it's a very bad habit - you do it without even knowing it - i.e. it's like 2nd nature and part of your daily routine - i.e. like a batter in the box readjusting his gloves, helmet, etc.