Via the Braintree Patch in Massachusetts:
Earlier this month a 23 year old man and a 44 year old woman were arrested after police found the pair huffing from balloons and a tank.
A police officer noticed a car "traveling slowly" before coming to a stop and partially blocking the road. When he approached the car he saw the man "holding a black object in his left hand near his face." When the man saw the officer he "frantically removed the object from his face and began concealing it under the driver's seat." Meanwhile the woman was trying to conceal a large blue nitrous tank between her legs. They were charged with inhaling a toxic substance.