Judy Lee, who has been teaching at Magnolia High School in Anaheim for the past eight years, is facing sex charges involving an underage former student.
The arrest happened after a deputy on routine patrol discovered the mother of four and a teen in a car in Stanton just before noon.
"They observed the female behind the wheel, leaning over, apparently kissing a male," said Jim Amormino of the Orange County Sheriff's Department.
Officials say Lee, 39, met the alleged victim while teaching at Magnolia High, and the sexual misconduct has allegedly been going on since November of last year. Authorities say she taught the student for four years.
"Some of the sexual misconduct acts occurred on the school grounds, in the classroom and at various other locations," Amormino said.
Authorities say there may be other victims. Anyone with information is urged to call Orange County Crime Stoppers at (855) TIP-OCCS.