Eleven states in the United States issue Blue Alerts, which are similar to the Amber Alerts, sent whenever a child is kidnapped. Sen. Ben Cardin of Maryland says he wants the Blue Alerts extended nationally.
"It's been very successful. The information gets out quickly. But as you know, the suspect could cross state lines, so it's important that we establish this nationally," he says.
Blue Alerts first started in Maryland last year, following the shooting death of state trooper Wesley Brown. He was killed while working off-duty as a security guard at a restaurant in Prince George's County in June.
Police say the suspect in the case had been escorted from the restaurant by Brown after a dispute over a bill, only to return a short time later and shoot the trooper in the back. Some of Brown's family members joined Cardin at Monday's announcement.