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Some of the subject areas in which states face the greatest teacher shortages are also areas that require the deepest subject-matter expertise. Staffing shortages are further exacerbated because schools or districts may not have high enough enrollments to necessitate full-time positions. Part-time licenses can be a creative mechanism to get content experts to teach a limited number of courses. Of course, a fully licensed teacher is best, but when that isn't an option, a part-time license allows students to benefit from content experts—individuals who are not interested in a full-time teaching position and are thus unlikely to pursue traditional or alternative certification. States should limit licensure requirements to those that verify subject-matter knowledge and address public safety, such as background checks.
For the importance of teachers' general academic ability, see R. Ferguson, "Paying for Public Education: New Evidence on How and Why Money Matters," Harvard Journal on Legislation 28 (1991), 465-498.
For more on math and science content knowledge, see D. Monk and J.R. King, "Subject Area Preparation of Secondary Mathematics and Science Teachers and Student Achievement," Economics of Education Review 12, no. 2 (1994), 125-145; R. Murnane, "Understanding the Sources of Teaching Competence: Choices, Skills, and the Limits of Training," Teachers College Record 84, no. 3 (1983)