A new state law has made it tougher for people who drive under the influence of drugs in New Hampshire. The law, which went into effect Jan. 1, has made driving impaired due to over-the-counter and prescription drugs illegal. “There was a loophole in the language which did not include many drugs which impair you to drive,” said State Police Sgt. Matthew Shapiro, commander of the drug recognition program. “People could be 10 times more impaired and not be prosecuted.”