[MOofficial]

I see this alot in College, but in high school it is not an approved mechanic.

Ball goes out of bounds baseline, offensive team keeps possesion of the ball. As the lead administering the throw in, his attention should be in the lane not when the ball is touched, so have the trail chop it in. Is there any concerns with that in the high school level or what is the reasoning behind it for not being an approved mechanic?