[brandda]

My esteemed colleagues have already discussed the mechanics of how to prevent this, so I won't bother.

I don't think there is a default call, but I fall back to the "if I did not see it, it did not happen." I have players look at me occasionally when they are away from the play and I was looking the other way and tell me they were interfered with or the runner left early or some such and I just tell them "I did not see it, no call".

I personally would not score the run if I did not see him cross the plate before the third out.