San Francisco Mayor Ed Lee announces plans to implement a version of "Laura's Law," a California measure which allows for court-ordered treatment of potentially dangerous mentally ill patients. The law is named for Laura Wilcox, a Nevada County woman who was murdered by a schizophrenic man with a history of violence. Lawmakers around the country are calling for such measures in the wake of recent mass shootings. But as Spencer Michels of PBS NewsHour reports, implementation of Laura's Law remains a challenge.