A Guerneville man who apparently left a computer thumb drive in the wrong place was arrested Tuesday on suspicion of possessing child pornography.

Santa Rosa police detectives booked Michael Wiley Robins, 39, into the Sonoma County Jail on a felony charge of possession of child pornography. Robins later was released on bail.

An investigation began Aug. 23 when an unidentified Santa Rosa business called police to report an employee had found a thumb drive with more than 30 pornographic images of minors, police said in a statement.

The business reported a female employee made the discovery, then Robins called her and said “he left his thumb drive in the computer and requested she place the thumb drive in his office mailbox,” police said.

Police obtained a search warrant to examine the thumb drive and determined it indeed contained images of child porn and information that confirmed Robins was its owner. On Tuesday, detectives arrested Robins and with a search warrant examined his residence. Police didn’t reveal Robins’ connection to the business.