A former substitute teacher who taught in multiple Greene County districts pleaded guilty to two federal child pornography charges this morning in U.S. District Court.

Brian Rohrback, who was previously employed as a substitute by the Xenia, Beavercreek, Fairborn, Greeneview and Bellbrook-Sugarcreek school districts, was charged with two counts of coercion and enticement, two counts of distribution of child pornography, and one count of possession of child pornography.

He took a plea deal in which he pleaded guilty to only two charges and will be sentenced in May. He could be sentenced to between 17 and 27 years in federal prison.

Investigators said his computer had 480 images of child pornography on it. He also had several e-mail conversations with teen boys about having sex. The government said he twice met teens younger than 16 for sex.

It is unknown if any of those victims were local.

FBI agents in Tampa, Fla. first discovered the crimes when Rohrback shared dozens of images of child pornography with an undercover federal agent on a peer-to-peer website.

The FBI referred the case to the Xenia Police Department, which began a months-long investigation that included serving a search warrant at Rohrback’s home on Maple Lane in Beavercreek.

Rohrback, 28, was arrested at his home in October.

School officials at Xenia, Fairborn and Beavercreek confirmed in October that Rohrback was employed at each of those districts at some point during the 2010-11 school year.

Greeneview Local Schools also listed Rohrback as an approved substitute teacher for that school year, and Bellbrook-Sugarcreek Local Schools reported that Rohrback worked as a student teacher at Bellbrook Middle School in the 2009-10 school year.

He has no prior criminal record and passed multiple background checks before being approved by these school districts, according to administrators. None of those schools reported having any issues with Rohrback while he was employed with them.