http://www.cfr.org/publication/11508/american_muslim_dilemma.html
Eben Kaplan
"Studies suggest U.S. prisons may be a particularly fertile breeding ground for Islamic radicalism. A special report from the George Washington University and the University of Virginia found a shortage of Muslim religious leaders to serve the demands of U.S. inmates, which allows extremist Muslims to more effectively recruit among the vulnerable prison population (PDF). One of the authors of the report, Frank J. Cilluffo, told a recent hearing of the Senate Committee on Homeland Security that prisons worldwide often lead to the radicalization of future terrorists (PDF), including such well-known figures as shoe-bomber Richard Reid and the late al-Qaeda in Iraq leader Abu Musab al-Zarqawi."