Virginia’s new law sends mixed messages to state employees, especially law enforcement officials. Imagine a state trooper pulling over a speeder and finding out through an ID check that the FBI has an alert for the driver as a suspected al-Qaeda operative. What should the trooper do if he knows or suspects the driver is a U.S. citizen? Do his duty and detain the suspect, which violates Virginia law? Or simply write the speeding ticket and send the driver on his way, not telling the FBI or the military, consequences be damned? Although the federal government has no inherent constitutional...