I has a trooper stop me in my old truck. I had lost my front plate and that was his initial excuse for stopping me. I wasn't fully dressed, though I has a little eyeliner, my hair in a ponytail through a ball cap, small stuff like that... He did call me Mam though.
Anyway, he said I stopped you because your front plate is gone and you were not wearing your seat belt. (OSP is nuts on the subject of seat belts and POI) I'm like "What do you mean I wasn't wearing my seat belt, you just watched me unbuckle to get my POI and registration from the glove box!" then he back peddled "oh well back a ways..." he then asks about the plate, and i explained I just notice, and have been checking the lost and found at the places I've been lately. then he's all "I'm going to give you a break on that if you promise to take care of it, however, I have to write you for the seat belt. (I checked, the plate would have been a bigger fine)
Anywho, I go before the judge, plea no contest, told my side(officer watched me unbuckle) the judge looked over the report, and said, "well I don't see in the report where the officer says he actually saw you driving without a belt, so I'm going to find you not guilty."
I think the bottom line here is, it's an older truck with a missing plate, (profiled me as poor) so he was most likely wanting an excuse to look for proof of insurance.
I think in the case of the OP, the patrolman may have been wanting to see, GPS or "fuzz-buster" and maybe a POI check as well. Sounds like he was intent on seeing the POI from the way story was told...