Within a far wider report by Clints Watts, aka CWOT on SWC, there is this passage, with my emphasis:
U.S. law enforcement has dramatically increased its community-oriented policing strategies with the Muslim community leading to increased detection and preemption of extremism. However, as noted by Kurzman and Jenkins, the past decade’s incidents of MuslimAmerican extremism provide no particular profile and provide no basis to conclude that extremists will reside in Muslim communities. In addition, if an extremist does reside in a Muslim community, there is no reason to assume that the Muslim community will be aware of potential extremists in their midst.
Link and the passage is on pg. 11:http://www.fpri.org/pubs/2012/201208...calization.pdf