This thread is about AFTER disarming, the act of the Officer RUNNING OF THE WEAPON SERIAL NUMBER (to check if it's stolen).
I believe it is also about disarming, as you cannot run the serial number without disarming. However, for the sake of staying on track I will address only the running of the serial number.
Otherwise a search by an LEO must only not be "unreasonable."
The search must be reasonable.
So the question is, is running the serial number of a firearm (search) during a routine traffic stop reasonable? I know of no case law applying directly to this scenario, but I do know a vehicle search is considered unreasonable without clear and articulable suspicion. Whether that is seeing something in the vehicle or having a dog do its dance, something has to trigger the search to make it reasonable. Of course they can ask to search, and most will say okay, but that is neither here nor there and for the record, I do not consent to searches. For a search of the serial number I would presume there should also be other factors that would lead to some suspicion that would make the search reasonable, e.g., felon in possession, burglary tools in the vehicle, other contraband in the vehicle, or a “stolen gun dog” dancing (okay, the last one probably doesn’t exist.)
Is it reasonable for the DPS to search the serial number of a firearm possessed by a holder of a Texas CHL with no other suspicions? This is a person licensed by the DPS, and now the DPS thinks it would be reasonable to believe that this person is now in possession of a stolen firearm?
I have to do mental gymnastics to get a yes out of this question.
IANAL – maybe that is why I cannot see it being reasonable.
"I cannot undertake to lay my finger on that article of the Constitution which granted a right to Congress of expending, on objects of benevolence, the money of their constituents." -- James Madison