A man from Mt. Vernon is in jail, after being charged with possession of child pornography in Jefferson County on Friday. 31-year-old Nathan Hall had his bail set at $100,000, according to information filed in court on Thursday. Hall allegedly on or around June 17th, knowingly and with intent to disseminate, reproduce, offered to disseminate or exhibited a videotape, film or other similar visual reproduction by computer of a child, whom the defendant reasonably should have known was under the age of 13, showing the child engaging in a sexual act. Presented with evidence in the case, a judge found probable cause to detain Hall on the charge. He will remain in jail until his preliminary hearing, which is scheduled for July 31st, with his court-appointed lawyer.