From CNN.com (http://www.cnn.com/2005/US/12/23/nuke.monitoring/index.html):
"The FBI has been covertly monitoring mosques and Muslim homes and businesses in U.S. cities for abnormal radiation levels since 2002, several government officials confirmed Friday.
...A Muslim advocacy group has said that the program is "misguided" and targets "the wrong people."
"It is a waste of time, it is a waste of resources and it is causing us to be concerned about our citizenship, our constitutional rights," Nihad Awad, executive director of the Council on American-Islamic Relations, told CNN."
Maybe I missed the part of the Constitution where you are allowed to have radioactive materials?
Checking for radioactivity is completely unobtrusive, so there is no privacy violation either.
These kind of comments from Muslim groups are why people question the intentions of Muslims when it comes to terrorism.