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Nics doesn't ask SN gun info, only if long gun or short gun.
True they can go back and see if you were called in by a FFL and if needed check with the FFL for your purchases.
This is one thing private sales does, it prevents one from being in the data base.
True they do not know if you bought the firearm called in by the FFL but it may not be true gun registration it does smell like people registration.
On lying or saying NO when asked by Dr or Medical facility. I agree it is none of their business, but one has just lied on a document that might come back to haunt you, like fraud or deception. The last ten years of my working life the Hospital insurance changed every 2 years, new Dr each time, been asked why this is needed, was told it is something they are required to ask. I said Nunya.
Under hippa Laws your medical history is private, well I and most of you, not all, have signed the share option when filling out forms so by giving us HIPPA the 1st thing they want to do is have us sign it away.
My wife the RN always declines to share, she says we are just a spot in too many data bases in wrong places if we sign.
I now refuse to sign.
I do not want an overworked Dr to have ammo to decide if I am more or less sane then they are.