Turns out that if you're going to wave around a 30-bullet magazine on national television, you might want to check your local gun laws: In a contentious interview Sunday with NRA chief Wayne LaPierre, Meet the Press host David Gregory held up what he said was just such a magazine, grilling his guest on whether limiting their capacities would help limit the carnage in mass shootings. LaPierre was far from convinced, but now Washington, DC, police are looking into whether Gregory violated DC laws that ban magazines that hold more than 10 rounds. DC laws prohibit the devices, even if they're not attached to a firearm, reports CNN. Gregory's was unattached. NBC studios are within city limits, notes Politico.