A former student Greenway High School in north Phoenix is facing child sex crimes charges.
Christopher Treacy, 19, is accused of crimes involving child exploitation.
Police say this started a year ago when Treacy's internet service provider alerted the National Center for Missing and Exploited Children that child porn was being uploaded from the ISP.
Officers say he admitted to watching and collecting child porn since he was 10 years old. Police say he also sought out underage girls online and getting a 9-year-old to send him explicit photos when he was 16.
Christopher Treacy, 19, is facing eight felony counts of sexual exploitation of a minor.
He was arrested Tuesday at his home near 29th Avenue and Greenway. Investigators say he told them he secretly took images of girls' private parts at his high school and posted them on social media.
A Glendale Union High School district spokeswoman confirmed to FOX 10 that Traecy was a student at Greenway High School until last year.
Police say Traecy said he stopped doing this last August. He said a female friend stopped talking to him after he posted a picture of her online causing him to break his old phone.
Records show that police found eight sexually graphic movies and pictures on Traecy's phone.
He's facing eight felony counts of sexual exploitation of a minor, a $75,000 bond and mandated electronic monitoring.