I get it, no one likes a bad call. I would like to just comment on your choice of words however. Coaches are not technically allowed to "challenge" a call unless it is a mis-application of the rules. They can approach the ref and ask for a quick "clarification" but without the benefit of video review, which only happens in the national finals, the ref can't change a judgement call. He can only call what HE THINKS HE saw, not what the coach thinks he saw.

I always tell a coach "this is what I thought I saw". I could be wrong on what happened but the only info I can go on to make a call is what I think I saw, not what the coach thinks he saw. I personally really like video review because it allows us to SEE what really happened and you can then correct an incorrect call if it happened. I have used video review at nationals and also at the British Columbia Provincial Championships. It works well but it requires equipment, staff and time. I wouldn't count on it here at the state level.