Crowdsourcing Security

Researchers at Purdue University are working with the state of Indiana to develop a system that would use a network of cell phones to detect and track radiation to help prevent terrorist attacks with radiological "dirty bombs" and nuclear weapons.

Such a system could blanket the nation with millions of cell phones equipped with radiation sensors able to detect even light residues of radioactive material. Because cell phones already contain global positioning locators, the network of phones would serve as a tracking system, said physics professor Ephraim Fischbach.

That's the way to do it: you co-opt people by making them part of society's tracking system, rather than regarding everyone as a potential terrorist who needs to be tracked. (Via Slashdot.)