New Hampshire DWI laws. New Hampshire DWI lawyer Mark Stevens. If you ever need help on New Hamps with a DWI case: dui laws, aggravated DWI laws, boating while intoxicated laws or DWI defense topics and issues visit ByeByeDWI.com or call the Law Offices of Mark Stevens at 603-893-0074. The Law Offices of Mark Stevens are located in Salem, New Hampshire.