I have a different view of the Hotchkiss one strike policy. Because the penalties are harsh, its easier for students to resist peer pressure in terms of drugs and alcohol. Everyone knows about the policy, it is enforced consistently. However, they also have a rule that allows students to bring inebriated friends to the health center and neither student will be penalized. In addition, many of the faculty will go out of their way to try to get students help without invoking the one strike consequences.
PS. In regards to another thread where people may have inferred my comments to be about Hotchkiss, please know that I have experience with several boarding schools.