Curveball

Rafid Ahmed Alwan al-Janabi, known by the Defense Intelligence Agency cryptonym "Curveball", is a German-French citizen who defected from Iraq in 1999, claiming that he had worked as a chemical engineer at a plant that manufactured mobile biological weapon laboratories as part of an Iraqi weapons of mass destruction (WMD) program. Alwan's allegations were subsequently shown to be false by the Iraq Survey Group's final report published in 2004.