A 40-year-old culinary arts teacher at Lincoln High School in Stockton was arrested after California Highway Patrol investigators alleged he possessed more than 65,000 images of child sexual abuse material. A preliminary examination of a computer at his home found child sexual abuse material. Nickolas Turpen-Arends was booked into the San Joaquin County Jail following a search warrant served at his Stockton residence on Tuesday, with CHP's SWAT team assisting in the operation.
According to ABC10, CHP booked Turpen-Arends under California Penal Code Section 311.11(a), which covers the knowing possession or control of material depicting a minor engaged in sexual conduct. The arrest followed a months-long investigation by CHP's Computer Crimes Investigation Unit, which tracked a single internet protocol address before investigators moved in with the search warrant, per CBS News. A full forensic examination of the seized computer is now underway.
Possession of child sexual abuse material in California is what's known as a wobbler offense. The legal overview also discusses prior history and enhanced penalties, according to FindLaw. As a felony, the charge carries up to three years in state prison, fines as high as $10,000, and sex offender registration, which is lifetime in many cases, according to FindLaw.
School District's Legal Obligations Kick In
School administrators are aware of Turpen-Arends's arrest and are cooperating with investigators, per CHP. Under California Education Code Section 44940, districts must place certificated teachers charged with a sex offense requiring registration on compulsory leave. The Commission on Teacher Credentialing automatically suspends a teacher's credential after receiving a forwarded complaint, information, or indictment.
Lincoln Unified School District superintendents must forward a copy of a complaint, information, or indictment to the Commission on Teacher Credentialing no later than 10 days after receiving it, according to the Commission on Teacher Credentialing. Lincoln High is a school in the district.
A District With a Prior Case Involving School Technology
This isn't the first time Lincoln Unified has faced a technology-related misconduct case involving a teacher. Back in 2011 and 2012, a district special education teacher was placed on paid administrative leave during an investigation into allegations she operated pornographic websites from a school-issued laptop, according to CBS News.
Turpen-Arends was booked into the San Joaquin County Jail.
Other CHP Investigations
The Stockton case involved CHP's Computer Crimes Investigation Unit.
The same unit arrested a 61-year-old Carmichael man in September 2025 after finding more than 1,800 CSAM files on his devices, working alongside the Sacramento Internet Crimes Against Children Task Force.
Key details remain unresolved in the Stockton case, including whether any of the material was connected to district-issued hardware or campus networks, and what the ongoing forensic examination of the seized computer may reveal about additional distribution or victim identification. Turpen-Arends was booked into the San Joaquin County Jail as the investigation continues.
