A Level Three sex offender is back in custody on new federal child pornography charges.
Federal prosecutors say 54-year-old Robert Carrigan of Farmington was arrested after investigators traced child sexual abuse material shared on Snapchat to him.
He's already on the sex offender registry after a 2004 conviction.
This time around, investigators recovered hundreds of images and several videos, some involving pre‑pubescent children.
Carrigan is charged with distribution, receipt, and possession of child pornography, crimes that carry a minimum 15-year federal sentence