Originally Posted by migjam
Either. Thats the beauty of clay. Question the call by asking to see the mark. I don't know how many calls I've gotten reversed when my opponent can't find the mark or see's the white mark on the line.
I don't see why you should get a call reversed when the opponent cannot find the mark. As long as he was sure it was out, there is no onus on him/her to find a mark. Only if he finds the mark and it shows that it was in does he have to reverse the call.