A Nevada lawmaker has been arrested on suspicion of threatening to harm a fellow legislator in a case that has prompted security protection to be provided for two top legislative leaders.North Las Vegas police said Sunday that they began a search for Assemblyman Steven Brooks, D-North Las Vegas, on Saturday after receiving corroborating witness statements supporting the victim's report of a threat. Police didn't identify the lawmaker who reported the threat.Brooks was taken into custody without incident during a traffic stop late Saturday afternoon in his hometown, police said, and he was booked into the Las Vegas jail on a …