How are they going to inspect for a 3" incursion

[Jon Stratis]

This is just my opinion, but it would be easiest to have a standard regulation ball at inspection so the inspectors can check that, on a flat ground just sitting there, a ball can't go more than 3 inches in. Yes, the ball won't be perfectly round, but it should be close enough... If the inspector sees any trouble spots, he can first warn the team, and second warn the refs. Then the refs just need to watch those trouble spots and for any obvious problems (like teams coming over a bump and landing on top of a ball).

It's going to be impossible for a ref to determine on the fly if your robot allows a 3 inch incursion under normal conditions - that determination almost has to be done off the field.