(Knob Lick, MO) A chaperone at the S Bar F Scout Ranch in Knob Lick is facing charges after he allegedly placed hidden cameras in bathrooms and showers at the camp. 39 year old David Lee Nelson of Redmond, Washington, has been charged with nine counts of invasion of privacy, two counts of first degree promoting child pornography, and four counts of second degree promoting child pornography. Authorities say Nelson arrived at the camp July 18th. The cameras were discovered in 2 of the bathrooms July 23rd. Six male victims have been identified so far, but officials say their could be more. If you have children who attended the camp between July 18th and July 23rd, you are urged to contact the St. Francois County Sheriff's Department at 573-756-3252, extension 213. Nelson is being held on a $500,000 cash only bond.