BIRMINGHAM (WWJ) – Federal agents have arrested a former Child Protective Services employee, accusing him of building a large collection of child porn.

William Shaffer, 71, of Birmingham now faces charges that include receipt and possession of child pornography.

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The Detroit News reports that Shaffer, a licensed social worker, allegedly spent close to $7,000 on 222 child porn films.

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The investigation dating back to 2010 involves an international movie production company that sold DVDs and streaming movies — many of which feature young boys.  In May 2011, agents seized a list of the company’s customer database, which led to Shaffer.

Police said they seized 61 movies from Shaffer’s home, including one showing naked boys eating desserts and other food. Investigators also seized copies of sexual stories about children, according to a criminal complaint. One story involved a 7th grade boy being abducted and raped, according to court records. It was unclear if Shaffer wrote the story, which references Michigan State University and 16 Mile Road.

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Shaffer faces up to 20 years in federal prison if convicted.