A Concord police officer who was fired a year ago for profiling Latino drivers next to a Mexican market is back on patrol with his old job. City officials approved Officer Jim Carroll's return last month following a favorable recommendation from an independent mediator. In 2004, the officer would park next to Mercado del Valle along Monument Boulevard and stop Latino drivers leaving the market for flimsy reasons to see if they had a driver's license, according to an internal police investigation. If they did not, he would cite them and have their cars towed. Former Police Chief Ron Ace,...