Perhaps to ensure they don't crash as often? Perhaps because the workload and manner in which they operate is different from the states? Perhaps because some pilots don't help to wash the aircraft and you can't use ladders unsupervised?
It is a different world to most flying roles. Up to 7 radios to monitor, a camera to operate, a night sun to operate, a pilot to liaise with, and incident notes to scribe. Don't forget to hit record. Don't forget to switch on, lower and RETRACT the downlink.
And let's not forget - 2 sets of eyes on screens are better than one.
Has anyone bothered to check how many crewmembers the Maryland police and NYPD operate with?