Lying prisoners: New laws crack down on jailhouse informants

A movement to put jailhouse informants under a more powerful microscope before they testify is gaining traction around the country, a byproduct of new DNA testing technology that has exonerated dozens of people wrongly locked up based on informants' lies.Several states have moved to toughen regulations on the use of such informants, whose credibility has always been an issue because they're motived to get their sentences reduced.The new rules include requiring pretrial hearings on whether prison