Check out this article that goes into some detail of Rep. Conyers the end racial profiling act that he wants to pass. It would cripple any and all law enforcement agencies ability to conduct any kind of terrorist investigations. Just see this one statement.
The act, although it doesn't as yet impose large penalties, would bar any federal, state or local law enforcement agency from "relying, to any degree, on race, ethnicity, national origin, or religion in selecting which individuals to subject to routine or spontaneous investigatory activities." That would include questioning, searches and seizures.
One of the act's central features is its definition of illegal profiling. Under it, if airport security personnel question passengers who are disproportionately Muslim or of Middle Eastern descent, this alone would constitute a presumptive violation of the law. Law enforcement agencies would bear the burden of proving that discrimination was not the cause.
http://www.startribune.com/191/story/874480.html