Preventing or even minimizing prison radicalization is always a challenge. It's more difficult, however, when we continually fail to vet the chaplains who minister to inmates.

Germany appears to have learned this lesson recently. Authorities there recently discovered that over 85 percent of their Muslim prison chaplains were actually agents of the Turkish government, the Gatestone Institute reports. Those clerics had to be terminated after the Turkish government refused to have them go through security checks, which are required by German law for all prison chaplains.