I would imagine the only time you might be successful in obtaining this information is if there was a substantial injury as a result of an unsafe condition created - i.e. Crabs playing kids significantly older and bigger than the norm in the age group. You would need to prove that the County knew that there was unsafe conditions and did not perform their due diligence - you would probably not even need the DOBs to prove this as the county employees involved with the program are fully aware of the hold backs and the potential for injury and are choosing to turn their backs on the practice and also ignore what is considered the governing guidance on the practice from USLAX regardless of how ineffectual the organization is.