As a veteran LE Officer I often engaged folks in conversations while on duty, doing so in a friendly respectful manner. Many times it was to see if all was well, perhaps something they should be aware of, etc.. At times
some folks may try to mislead me, outright lie, etc., thus Probable cause to go to the next step. That is part of LE.
As pertaining to Model Aircraft, nearly all Officers have more to do than harass folks having fun with their model aircraft and often the Officer is just interested in seeing the thing fly!
I see many posts here from folks giving free legal advice, most poor "they have no right", etc. THAT ADVICE IS WORTH ABOUT AS MUCH AS IT COSTS YOU TO POST HERE!!! Nice will get you a long way with LE.