We do not deal with concussions other than observing and reporting incidents where a player might have concussions. We do not diagnose them and it is required by state law to be documented. Players play based on medical professional's positions and we just let it be known that there might be an issue. And we have to pass a concussion protocol exam to keep our license every 3 years.
But again in basketball, it is very rare. In football, it is much more common and you know when a kid might be likely "dinged" by their behavior after a hit or contact. All we do is report when a player leaves the game and report when they are coming back in. We do not diagnose anything. If the medical professional says they have not experienced a concussion we let them come back in the game. Just like you decide if a player is too hurt to continue immediately. Ultimately someone decides if they are medically cleared to play or not. Even the coach cannot sign off on a player playing without information from the medical professional. And since you love the rulebook, it is stated in the rulebook.
Peace