The players are reflective of the coach.
As a coach be it high school or college there is no reason to not be in control of your player's actions both on and off of the field.
You set the rules, if someone violates the rules, first go round they are warned, second time there is no excuses, they are off the team - period. This is all explained throughly up front and a contract is signed, so there is no room for "I did not know".
A college coach has a chance to do kind of a background investigation in the recruiting process, if he is smart, to find out not only how good of an athlete he is getting but how good of a young man as well.
I don't see why a HS coach would not know what type of kid he is picking for his team unless the player is a transfer student from out of the area.
Bottom line, my players are going to be hand picked good athletes and top notch young men without a lot of baggage.
Another thing, when a student chooses to become a student/athlete his or her expectation of proper behavior has just reached new levels. You are now representing your school in the public eye.
Central VA Baseball, Inc.CV