MARIPOSA COUNTY — A months-long investigation into one of the most severe child sexual abuse material (CSAM) cases in Mariposa County history has led to the arrest of 58-year-old Robert Brooks.
Arrest Tied to Digital Evidence
58-year-old suspect, Robert Brooks.
Deputies located and arrested Brooks on April 15, 2025, in Calaveras County, where he had been working. They transported him to the Mariposa County Jail, where he remains in custody with bail set at $50,000.
The arrest follows a search warrant executed in September 2024 at a property in the Coulterville/Greeley Hill area. Investigators seized 133 digital devices from Brooks’ residence. An initial forensic preview revealed CSAM on 25 of those devices.
The Mariposa County Sheriff’s Office partnered with the Central California Internet Crimes Against Children (ICAC) Task Force and the Fresno Multi-Agency Digital (MAD) Lab for the digital forensic analysis. Over the course of several months, forensic experts extracted and reviewed content from the devices. The results were staggering; 14,649 videos and 886,169 images were uncovered, with a significant portion identified as child sexual abuse material.
Authorities issued a Ramey warrant and arrested Brooks without incident. He has since been booked under Penal Code 311.11(a) – Possession of Obscene Matter Depicting a Minor Engaged in Sexual Conduct.
Sheriff’s Statement & Investigation
Moreover, the Mariposa County Sheriff addressed the community following the arrest, praising the efforts of those involved in the investigation.
Mariposa County Sheriff Office
“This is one of the most severe CSAM cases we’ve ever seen in Mariposa County,” said Mariposa County Sheriff.
They continued, “These cases are disturbing on every level, but I want the community to know we will never stop hunting down predators who exploit children. The work done by our investigators, the ICAC Task Force, and our forensic partners was nothing short of exceptional. These are not easy cases to work, emotionally or mentally, but our team remains committed to protecting the most vulnerable members of our community.”
The investigation remains active. Authorities anticipate that additional charges may follow as forensic analysis continues. Anyone with information regarding this case or potential victims is urged to contact the Mariposa County Sheriff’s Office at (209) 966-3615.
