Ontario, Calif. ? A substitute elementary school teacher was charged Friday with lewd and lascivious acts involving a 10-year-old girl, and police said he claimed to have molested more than 100 students.

Eric Norman Olsen, 28, of Ontario, told detectives that he molested between 100 and 200 elementary school students since becoming a teacher three years ago, said police Detective Diane Galindo. He was scheduled to be arraigned Aug. 8.

Police said his resume shows that he has taught in different school districts throughout San Bernardino, Riverside and Kern counties.

The probe began on June 13 after a male student allegedly witnessed Olsen molest the 10-year-old girl and told school officials, Galindo said. Olsen did not have a criminal background.