Prosecutors say a former bus driver for Iraq war contractor KBR who was fired in 2006 for possessing child pornography has again been caught with a large collection of child porn.

Ira L. Waltrip of Lampasas, Texas, who had been working for KBR at Camp Liberty in Baghdad, was charged this week in U.S. District Court with possessing child pornography. He had somehow been rehired by the defense contractor.

According to a court affidavit, KBR fired Waltrip in January 2006 after he was discovered with a collection of child pornography.

At the time, authorities elected not to prosecute Waltrip because they said they lacked sufficient evidence that the pornography depicted minors.

Houston-based KBR rehired Waltrip in December 2006 as a bus driver. Again, he was caught with an extensive library of child pornography. It is not entirely clear how Waltrip managed to get rehired by KBR.