For the record, this is not a girl problem. I work boys basketball exclusively at the high school and college level and this comes up often in boy's or men's basketball. Happen at a camp where this was a possible issue at a camp in April and that was a college camp. A clinician discussed that a boy's hair might be an issue based on what he had in it and stated, "That has to be determined by someone higher than my pay grade, but something should be addressed if it is legal." It was my game at the time and we allowed it or better yet did not make an issue because it was not very clear. I think he would have been OK based on the location of some clamps this kid had in his hair. A few weeks later the NF came out with their rules.
Peace