BOULDER, Colorado, Jan. 17 -- The National Education Policy Center issued the following news release: * * * - New research brief explores ethical, legal and policy issues associated with the use of teacher-focused brand ambassador marketing in schools. * * * Marketing in schools has a new twist, and teachers are at the center. Corporate firms, particularly those that produce education technology products, have begun to contract teachers to become so-called brand ambassadors. This new phenome  more