Well, the feds have been consistent -- smoke weed and no guns.
It does highlight the fact that the ATF may now be going into doctors' offices and demanding records from them.
Should know that anytime you have to document what you own, what you do, or where you go, it can be used against you in a court of law.
5th amendment controls these "requirements". You cannot be required to:
a) register your gun
b) inform the state of your gun purchase
c) make a record for the gov of a purchase
d) sign any "book" to enter a public building
e) perform any act that would create a record that could be used against you