The Post-Gazette asked education officials in the 50 states and the District of Columbia for copies of teacher revocation orders during the past five years. We received responses from 45 states and the D.C. public schools. Of those, 27 states, including Pennsylvania, agreed to provide specific details on the reason for each revocation.

The graphic, based on information from those 27 states, shows a 78 percent  increase in the number of teachers who have lost their teaching certificate for sex-related offenses ranging from sexual harassment to child molestation from 1994 through 1998.