LOGAN — A Logan man has been charged with downloading and manufacturing his own child pornography.

William Lawrence Larson, 38, was charged Thursday in 1st District Court with 10 counts of sexual exploitation of a minor, a second-degree felony; propelling a bodily substance at an officer, a class A misdemeanor; and interfering with an arresting officer, a class B misdemeanor.

Logan Police Capt. Tyson Budge said investigators were first alerted to Larson by the National Center for Missing and Exploited Children who detected child pornography being downloaded at his address.

In addition to finding child porn that had been downloaded onto several thumb drives and other electronic devices, Budge said, investigators also found images of two local children, both under 10, who had pornographic pictures taken of them. The children had been left in Larson's care to watch over, he said. Police did not believe Thursday that the images had been uploaded to any file-sharing websites.

Investigators have talked with the parents of the children. They are now asking any other residents who may have had their children watched by Larson, or had contact with him, to call them at 435-716-9459.

In addition to finding child pornography, police say Larson spit on one of the officers after they arrived.

Larson was booked into the Cache County Jail.

According to court records, he was convicted of two counts of assault by a prisoner in 2009 in Duchesne County. He pleaded guilty but mentally ill to charges that were reduced from third-degree felonies to class A misdemeanors. He was sent to the Utah State Hospital. But during a 2010 court hearing, the court noted that "safety became an issue for the workers and they weren't able to treat Mr. Larson effectively, that his behaviors do not appear to be rooted in any kind of psychotic or effective disorder nor the product of pervasive developmental disorder."

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Also in 2009, Larson was again found guilty but mentally ill of drug distribution, a third-degree felony. He was sentenced to up to five years in prison. Larson was also found guilty of drug possession in 2005, a third-degree felony and placed on probation for three years, according to court records.

His criminal history also includes a conviction of assault against a police officer in Salt Lake County in 2003, for which he was sentenced to 60 days in jail and probation; a forgery conviction in 2002, and was sentenced to six months in jail; guilty but mentally ill of misdemeanor simple assault in 1997.

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