“A new law that took effect at the beginning of 2013 bans driving under the influence of not just illegal drugs, alcohol and prescription painkillers, but all over-the-counter drugs as well, along with ‘any other chemical substance, natural or synthetic, which impairs a person’s ability to drive.’ The bottom line is, if an officer suspects a driver is impaired and that driver admits to taking any kind of drug, an arrest will be made. ‘There is no shortage of these drivers out there,’ a state police spokesperson told the Tribune. ‘We are targeting them aggressively.’”
http://www.rawstory.com/rs/2013/01/14/driving-under-the-influence-of-nyquil-banned-in-new-hampshire/