Then get the Club to secure the perimeter so they rip their undies getting over the razor wire.
Did the trainer sign the Asian couple up for a share in a syndicate?
Many stables put their own CCTV systems in and the perimeter is managed by the Racing Club. I imagine some leverage off the Club broadband/WiFi links that they require to be compliant with Raceday protocols.
The RIB's role isn't managing the security of every training stable in NZ. Hell most complain enough as it is about the expense of the outfit.