Libertyville Middle School Teacher AI-Generated CSAM Arrest (Sheffer - Highland Middle School)

Marshall Sheffer (reported in some outlets as Matthew Sheffer), 44, a social studies teacher with approximately 18 years of employment at Libertyville School District 70, was arrested on July 3, 2026 on charges of creating AI-generated child sexual abuse material depicting his own students.

The investigation began on June 3, 2026 — the second-to-last day of the school year — when students reported to school staff that they believed Sheffer was video recording them in his classroom. He was immediately removed from the classroom and placed on administrative leave.

The investigation found:

1. Libertyville detectives obtained Sheffer's phone; forensic examination by the Lake County State's Attorney's Office Cyber Lab revealed 'numerous images of students that had been altered using artificial intelligence to create explicit images'
2. He allegedly videotaped current and former students and used generative AI software to alter the footage into explicit sexual content
3. Multiple electronic devices were recovered from his residence, with additional explicit child images seized with the assistance of Lake County Sheriff's Office Electronic Storage Detection K9 units

Sheffer was charged with 8 counts of child pornography — 2 Class X felonies and 6 Class 1 felonies. Superintendent Rebecca Jenkins said the district fully cooperated with the investigation and is providing support services to affected students and families.

Note: news outlets are split on the first name — Daily Herald and Lake & McHenry County Scanner report 'Marshall'; CBS Chicago and ABC7 report 'Matthew.'

• Generative AI image-alteration tools used to transform covert classroom recordings of real, identifiable students into explicit sexual imagery
• Tools enabled an authority figure with daily access to children to convert ordinary footage into child sexual abuse material
• Lowered the technical barrier to producing realistic abuse material targeting specific, known minors

Generative AI image-alteration tools allowed a teacher — an authority figure with sustained, trusted access to children — to convert covert classroom recordings of identifiable students into child sexual abuse material.

This is third-party harm facilitation involving minors: the AI user was the offender, and the victims were his own students. Beyond the criminal nature of the material, victims of non-consensual AI sexualization face documented psychological, reputational, and safety harms; the school district deployed counseling and support services for affected students and families.

• June 3, 2026: Students reported to school staff that they believed their teacher was recording them; he was immediately removed from the classroom and placed on administrative leave
• July 3, 2026: Sheffer arrested and charged with 8 counts of child pornography (2 Class X felonies, 6 Class 1 felonies)
• July 6, 2026: Detention hearing; Lake County State's Attorney's Office filed a petition to detain him in Lake County Jail pending trial
• District 70 reviewing policies on staff use of personal technology during the school day; support services made available to affected students and families