The California State Senate will be watching what children do on their cell phones while in school. The state just passed a bill that would add “sexting” to the list of infractions that are considered grounds for expulsion, according to a report from The Examiner.

The bill SB919, which defines sexting as “sending or receiving sexually explicit pictures or video electronically,” introduced by Senator Ted Lieu, was passed unanimously and is on its way to the Assembly.

California law gives schools jurisdiction to punish students for behavior that occurs on school grounds, while coming to or leaving school, during lunch breaks or en route to school-sponsored activities.

According to the Associated Press, Lieu says it’s a growing problem in California schools, citing a study saying 20% of teens reported sending or posting nude or semi-nude pictures and videos of themselves.