The honor society at my college decided to solve the problem of students passing around answer sets. They created an answer database (with support of the dean)

The honor society at my college decided to solve the problem of students passing around answer sets. They created an answer database (with support of the dean) to ensure that answers were not unfairly shared. It worked great. Students got a lot more practice material. Some teachers hated it since they had to change tests, but even if they refused, at least the system is fair (thus no more unfair advantages from "cheating").