Refereeing the Defense

[Vinski]

I could really use some help with the subject of refereeing the defense and what to watch for when the ball is in your primary. When doing this, I believe I’m catching the on-ball fouls pretty good but I’m pretty sure I am missing some travels and maybe other non-ball match-up fouls. Also, I find it difficult to determine who the OOB is on when there is a scramble or a tip of a hand out of no where. I’m sure my technique is flawed and would greatly appreciate some insight of you more experienced refs. Please help.