State regulators routinely allowed delays in MBTA safety investigations

You might be familiar with the Department of Public Utilities as the state office that regulates electricity and gas companies. However, they're also responsible for overseeing safety on the MBTA. A new investigative report from WBUR shows that the DPU has routinely allowed the T to file safety investigations late, delaying the review process. Senior Investigative Reporter Beth Healy joins The Common to discuss her findings.