I see them all the time,
Mostly because I fly rotary as well as fixed wing. Look carefully at the birds. Most of the police Helicoptors will have a secondary number on the under carriage for Identification purposes, again mostly used by squad cops. Also look to see if you can spot the lights and cameras mounted to the under carriage. The lights are very large, and you can't really miss them.
You said that you saw three of them ? Then I highly doubt that they were looking for grows. Training all takes place in the same bird, not three different ones. Were these birds small two seaters ? or larger. Most police departments cannot afford to use three of them, at most you will see two that belong to them. This may have been a company move or some site seeing by some rich executives.These are among the most widely used rotary craft that is out there.
The Enstrom, Bell, MD500 are the more common of them. See if you can spot the lights and cameras. Bad angle to catch the undercarriage numbers though. You might consider getting yourself a pair of high powered binoculars and do a little site seeing on them if you get the chance. Also remember that the pilot in command literally has his hands full controlling the aircraft. He has to operate the pedals,the cyclic,pulling collective, watching the throttle settings, weather, radio, situational awareness, and a meriod of other things as well as chores like all the radio work, including altitude change requests.
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smoke in peace
KingKahuuna