Marchetti taught at Brien McMahon High School, according to court documents. Officials there confirmed that he was on administrative leave in May before resigning in June.
Police said students actually put a stop to the recordings by bringing it to the attention of school administrators. They said they noticed Marchetti wheeling his desk chair over to the girls with his cell phone on his leg.
Investigators found a number of videos on the suspect's phone.
Marchetti is due in Norwalk Superior Court.
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