Never occurred to me to even look before today. Per Commonwealth of Virginia:
§ 46.2-1088.4. Devices used to supply nitrous oxide to the engines of motor vehicles.
It shall be unlawful for any person to operate any motor vehicle on the highways of the Commonwealth if such vehicle is equipped with any device that supplies the vehicle's engine with nitrous oxide, unless the device has been disabled such that the supply of nitrous oxide is disconnected and not readily accessible to the source of delivery.
Violation of any provision of this section shall constitute a Class 3 misdemeanor.
2004, c. 282.And:
Class 3 and 4 misdemeanors, the least serious misdemeanors, are punishable by fines, but no jail time. A Class 3 misdemeanor is punishable by a fine of up to $500.Sounds simple to me: leave the hose off on the street... unless you're racing for more than $500
Maryland as of 2019:
(b) Except as provided in subsection (c) of this section, a person may not operate on a highway a motor vehicle equipped with a power booster system.
(c) A person may operate on a highway a motor vehicle equipped with a power booster if:
(1) The vehicle is enroute to or from a track where the vehicle is used for racing and the power booster system is inoperative; or
(2) The container of nitrous oxide has been removed from the vehicle.
(d) Every motor vehicle equipped with a power booster system shall be identified with a decal that:
(1) Is a diamond shaped design consisting of the words “Compressed Gas D.O.T. No. 1070” in silver scotchlite letters 1 inch high on a black background with a silver scotchlite border;
$1000 fine. Cops had a heyday for awhile.
And twirly whirlies to get there early and prochargers became fashionable too.