Tucson hospitals investing in Mexican health care Idea is to keep foreigners out of American ERs SUSAN CARROLL Arizona Republic Tucson Bureau NOGALES, Son. – Tucson hospital administrators say they have an innovative way to save money: spend money to upgrade the care available in Mexico. Health-care officials in Tucson and Nogales, Ariz., strapped with millions in unpaid medical bills from Mexican patients, say investing in new equipment and better training in hospitals south of the border has reduced the…