Two St. Francois County men are facing felony charges following separate child pornography investigations conducted by the Missouri State Highway Patrol’s Division of Drug and Crime Control (DDCC).

The arrests, announced Wednesday, were the result of probes launched earlier this year by the patrol’s Special Victims Unit after receiving tips from the National Center for Missing and Exploited Children.

Investigators first contacted John F. McCallum, 46, of Farmington, on March 9. Authorities said evidence of child sexual abuse material (CSAM) was discovered during the interaction, leading to McCallum’s arrest. He was formally charged Tuesday with one count each of promoting child pornography and possession of child pornography. He is being held in the St. Francois County Jail on a $100,000 bond.

In a separate case, investigators interviewed William E. Watson, 47, of Park Hills, on March 10. Following a consent search of an electronic device and a subsequent search of his residence, authorities reportedly located both CSAM and illicit narcotics. Watson was charged Wednesday with promoting child pornography, possession of child pornography, possession of a controlled substance, and failing to register as a sex offender. He remains in custody on a $500,000 bond.

The DDCC was assisted in the investigations by the Farmington Police Department, the State Technical Assistance Team, and the Missouri Digital Forensic Center.