According to Tony Naccarato Jr. the LAPD has a patrol car watching the r/c and drone flying at the Los Angeles Model Airport at Sepulveda Basin every day. They are checking drone operators for their registration and r/c flyers to see if they fly too high. Sepulveda Basin is close to Van Nuys Airport.
According to AMA, there is FAA training for the locals in this regard. How good the training is has yet to be seen. This is a works in progress and could be nasty in some instances…And again, per AMA and FAA, free flight is NOT required to have registration.