Make the student’s parents or guardians sign release forms at the beginning of the year before they can use the ‘playground facilities’ at the school, agreeing not to hold the school liable for such things. ....Problem solved.
Sure the local attorneys will throw a bitch fit, because they’ll have one less revenue stream, fleecing the tax payers.
How do you prevent children from using the equipment during non-school hours?
Some courts ignore liability releases. They claim no one can waive their rights. And since the law is ‘self-regulating’, they get away with that crap.