A local substitute teacher is now in custody on child pornography charges. Henderson Police arrested 26-year-old Aaron Ringewold as part of a long-term investigation into child porn on computers. Ringewold faces 17 counts of child pornography possession for images that were reportedly found on his computer. Police do not believe the pornography involved any past or present students of Ringewold. He most recently taught at O'Callaghan Middle School. Anyone with information that can help in the case is asked to call Henderson Police at 267-4750.