OT Teaser - Sport where players touch ref?

[rotationslim]

Here is a brain teaser I just thought of.. not about basketball, but about officiating, so I am slipping it in.

In what sport do athletes routinely and purposefully make physical contact with the officials, as many as 3 seperate times during a contest.

Hints:
* It is a sport commonly played in High School
* While this "contact" may or may not be actually written into the rule book, it is a commonly accepted practice (at least here in Michigan High Schools)