In New Hampshire, as in all states, it’s a crime to operate a vehicle with a blood alcohol content of .08 or higher. If arrested and convicted for this crime, judges typically apply a set of minimum and maximum sentencing guidelines. When determining the sentence, judges and prosecutors commonly weigh mitigating and aggravating factors.
Sobriety checkpoints are legal in New Hampshire. (See N.H. Rev. Stat. Ann. §265:1-a. They are valid under the state constitution only with Superior Court order.)These checkpoints (also referred to as "mobile checkpoints" or "roadblocks") are police traffic stops that are not tied to any specific or individual suspicions.