Witnesses, from left, Sybrina Fulton, mother of Trayvon Martin; Ronald S. Sullivan, Jr., Clinical Professor of Law, Director of the Criminal Justice Institute, Harvard Law School; David LaBahn, Association of Prosecuting Attorneys president and CEO; Ilya Shapiro, Senior Fellow in Constitutional Studies at Cato Institute; John R. Lott, Jr., president, Crime Prevention Research Center of Swarthmore, Pa.; and Lucia McBath of Atlanta, Ga.; are sworn in on Capitol Hill in Washington, Tuesday, Oct. 29, 2013, prior to testifying before a Senate Judiciary subcommittee hearing on so-called "stand your ground laws."      (AP Photo/Manuel Balce Ceneta)

Photo by: Manuel Balce Ceneta

Witnesses, from left, Sybrina Fulton, mother of Trayvon Martin; Ronald S. Sullivan, Jr., Clinical Professor of Law, Director of the Criminal Justice Institute, Harvard Law School; David LaBahn, Association of Prosecuting Attorneys president and CEO; Ilya Shapiro, Senior Fellow in Constitutional Studies at Cato Institute; John R. Lott, Jr., president, Crime Prevention Research Center of Swarthmore, Pa.; and Lucia McBath of Atlanta, Ga.; are sworn in on Capitol Hill in Washington, Tuesday, Oct. 29, 2013, prior to testifying before a Senate Judiciary subcommittee hearing on so-called "stand your ground laws." (AP Photo/Manuel Balce Ceneta)