Hundreds of people have contacted the FBI about a teacher suspected of drugging and molesting boys during a four-decade career at international schools on four continents, greatly expanding the potential number of suspected victims. The FBI said last month that William Vahey had molested at least 90 boys, whose photos were found on a memory drive stolen by his maid. Vahey killed himself at age 64 after evidence of molestation was found. He was one of the most beloved teachers in the world of international schools that serve the children of diplomats, well-off Americans and local elites. The discovery of his molestation has set off a crisis in the community of international schools, where parents are being told their children may have been victims, and administrators are scurrying to close loopholes exposed by Vahey's abuses. There were decades of missed opportunities to expose Vahey, starting with an early California sex-abuse conviction that didn't prevent him taking a series of jobs exposing him to children. Vahey began his international teaching career at the American School in Tehran, the first in a series of stays around the Middle East and Europe. He taught history, social studies and related subjects in Lebanon, Spain, Iran, Greece, Indonesia and Saudi Arabia, almost always to middle school students. In addition to teaching, he coached basketball and led school trips to Bahrain, Turkey and Africa.