What is sadd? how has the organization changed since its founding?

SADD is abbreviated from Students Against Destructive Decisions, and is an organization, as the name itself says, whose aim is to prevent accidents from students taking potentially destructive decisions.
Since its founding, the organization changed its name - it used to be named Students Against Driving Drunk, however, they widened their area of these destructive decisions, not only to driving drunk, but to any other decision that may harm a student.