And, yes, there is a fairly simple solution to this problem that starts with infiltrating the cells.
This is clearly a job for government, the federal government in particular which allowed and encouraged these people to come and live in the US. The federal government is not doing its job. Do you wonder why that is?
As it was in the Cold War, the government itself has been infiltrated.
The Obama doctrine is to support Islamic imperialism around the world. He may be a secular humanist but he has a hard on for Islamic theocratic rule.