OH, SURE, THIS WILL BE EFFECTIVE
New York State mandates registration of beer kegs.
(Thanks to Howard Hinnant, who notes that the law requires that "if you buy a keg of beer -- 15.5 gallons -- you must consume it within 30 days! Do the math. That's nearly a 6-pack of beer a day! What a sweet deal for the beer distributers here. My guess is that Coke and Pepsi will want in on this deal too pretty soon.")