Many states currently offer bilingual certification or endorsement, encouraging both practicing teachers and prospective teachers to complete their requirements necessary to add this certification on to their regular teaching license. Although these requirements routinely include courses in bilingual education, the "second" language proficiency of the teacher is only sometimes addressed. The purpose of this paper is to discuss proficiency testing of bilingual teachers across the United States. After discussing testing of bilingual teachers in general, a specific measure used in Arizona will be described and evaluated. A sample questionnaire is appended. (Contains 19 references.) (Author)