This is geniunely creepy stuff. These were Maryland STATE TROOPERS asking about ammunition purchases. I do not know what conferences these goblin wannabees attend, but we, the public, have a right to know.
From David Codrea’s Waronguns:
There are no laws in the State of Maryland whatsoever that cover the use of ammunition logs at the point of sale. None. This is pure policy intimidation on the part of local and State police and if you are in Maryland and presented with a requirement to sign such a log, REFUSE politely and call a lawyer.
There are no laws in the State of Maryland that restrict the type or quantity of ammunition you may possess. The only requirement is that you are not permitted to purchase handgun ammunition if under the age of 21. If the police show up and question you about your purchases or their quantities, REFUSE politely and call a lawyer. Request to see ID and demand to see a warrant.