This is happening in American jails to an alarming degree. Read : The Fertile Soil of Jihad: Terrorism’s Prison Connection by Patrick T. Dunleavy (Sep 2011)
http://www.familysecuritymatters.org/publications/detail/interview-with-patrick-t-dunleavy
Radical Islamists have found a new place for recruiting fresh followers: German prisons. In some jails, Muslim chaplains are successfully promoting a more moderate approach to the faith, but many more of them are needed.
The evening sun shines through the barred windows onto the 18 men. They’re wearing ruby-colored T-shirts and black pants. Some nudge each other’s shoulders out of sheer boredom, while others linger in groups at the corner of the sparse room. The men speak Turkish, Arabic and German. One keeps glancing out the window into the prison yard.
A man with a full beard and violet-colored turban strides before the prisoners, his colorfully striped linen robe flowing behind him. Husamuddin Meyer rolls out his prayer rug and begins to pray. Swaying back and forth, he seems almost to be singing the Arabic verses.
The men stand silently in two rows in front of Meyer, backs straight and eyes staring straight ahead. They then kneel, lowering their heads until their foreheads touch the ground. They repeat this four to five times before chanting, “Allahu akbar,” God is great. Meyer gestures with his hand and the prisoners form a semi-circle around him to listen to him telling a story from the Koran. Nobody interrupts.
Meyer is a Muslim chaplain; he wears a beard, a turban and a ring on his finger as prescribed by the Sunna. He also walks with a wooden cane, whose thud announces his arrival when he swiftly makes his way through the prison corridors. He visits the correctional facility in the central German city of Wiesbaden three times each week, where he prays together with Muslim prisoners and provides them with religious counseling.
Meyer is hoping to show the prisoners the path to Allah. More importantly, though, he is seeking to sway the faithful away from more radical interpretations of the Koran. He warns in particular against Salafism, the fundamentalist stream of Islam that is currently enjoying growing popularity among young men. When he discusses the issue, his generally pleasant voice suddenly hardens. “Salafism is like a disease,” Meyer says. “Once somebody has it, they start infecting others.”