North Las Vegas wants to use red-light cameras to catch speeding drivers who run the lights. One study says there are fewer fatalities with cameras, and police say it frees them up to pursue other crimes. But critics say the cameras are just there to generate revenue by ticketing speeders. And some camera systems mistakenly ticket innocent drivers. Should we have cameras? Do they make us safer drivers, and are they reliable? And with all this surveillance, are we becoming a police state?