B+
Campus Security Good, Hanover Police Awful
Campus security (Safety and Security, aka S&S) is pretty good, they usually aren't too strict. If you are clearly drunk and might need some help, they send you to dicks house or they will respond to a call (a "Good Sam") asking for their help. Neither gets you in legitimate trouble. They do put fraternities on probation, however, fairly frequently.
Hanover police, however, are a completely different story. They seem to do anything they can to get dartmouth kids in trouble (probably because they don't have anything else to do). They will literally drive around looking for any drunk person they can find. I know many, many kids who have been arrested for drinking. They also conduct drug stings. Everyone hates hpo and the chief is constantly mocked by students.