SIOUX FALLS, S.D. (KELO) — A former Sioux Falls middle school teacher is accused of committing crimes against children for nearly three years.

KELOLAND News first told you about Justin Preuschl, 28, last March, when he was charged with solicitation of a minor and lost his teaching job.

SD man accused of sex trafficking

Since then, the case has moved to federal court. A new filing says Preuschl now faces 47 counts of child pornography and transferring obscene materials to a minor.

The crimes allegedly began in June of 2021 and continued until February of 2024, which is two years longer than originally thought. He pleaded not guilty to all of the charges on Thursday.

The US Attorney’s office has said that Preuschl posed as a 15-year-old boy online and pressured multiple girls to send him sexually explicit materials. He also attempted to send them pornography. Preuschl was employed at Whittier Middle School at the time of some of the alleged crimes. He also worked as a substitute teacher in Brandon.