If the private emails of the head of the Central Intelligence Agency aren't safe from police snooping, how safe do you think yours are? The affair between CIA director David Petraeus and his biographer Paula Broadwell was uncovered when investigators from the FBI raided their email accounts. On what authority did the agency snoop? Largely its own. Reason Science Correspondent Ronald Bailey argues that it is way past time that law enforcement's invasive surveillance powers be reined in by extending the Fourth Amendment's protections against unreasonable searches and seizures to cyberspace.