[nathanww]

Legal? Yes
Practical? Not really.

We tested this a few days ago, and found that due to the surface area/mass ratio of the ball, air had a minimal effect, if any. Basically, the only way we could even slightly shift the ball was with a highly collimated stream of air from a leaf blower that didn't really have enough area to act as an effective defense.

Also, one has to remember both that the trailer is swinging around and that some robots are going to come and dump balls in