ROCKVILLE, Md. -- The agency that oversees training and hiring standards for police departments in Maryland is looking at a proposal that would let noncitizens with green cards become police officers. The proposal is being championed by Montgomery County Police Chief Thomas Manger. He said it doesn't make sense that legal immigrants can join the U.S. military but can't become law enforcement officers. The Maryland Police Training Commission could vote on the issue next month. Critics said it would be difficult to check the backgrounds of noncitizens applying to be officers, and they said the proposal could allow terrorists to...