Sept. 25, 2006 — The shooting of a Houston police officer has sparked a new battle over immigration. Juan Leonardo Quintero, an illegal immigrant, has been charged with killing a Houston police officer last week after a routine traffic stop. Police Chief Harold Hurtt blamed the federal government for failing to secure U.S. borders. Quintero allegedly shot Officer Rodney Johnson four times in the head while in handcuffs in the back seat of his patrol car. Johnson arrested Quintero during a routine traffic stop for speeding but apparently missed the suspect's gun in a pat-down search. Following the shooting, a...