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CSB's Merritt, NRDC's Devine discuss chemical security, hazmat freight transit

Recent train accidents highlight the danger of deadly toxic spills. Some cities want to ban hazmat freight trains. And most chemical plants lack strong safeguards against terrorist sabotage. Carolyn Merritt, chairwoman and chief executive officer of the U.S. Chemical Safety and Hazard Investigation Board, and Jon Devine, a senior attorney with the Natural Resources Defense Council, discuss the current state of plant and transportation security and what to do about it.