The state should close loopholes that allow teachers who have not met licensure requirements to continue teaching.
Colorado requires that all new teachers pass all required subject-matter tests as a condition of initial licensure.
1 Colorado Code of Regulations 301-37: Rule 2260.5-R-3.05; 2260.5-R-3.01(5)
Colorado recognized the factual accuracy of this analysis.
Research has shown that "the difference in student performance in a single academic year from having a good as opposed to a bad teacher can be more than one full year of standardized achievement." See E. Hanushek, "The Trade-Off between Child Quantity and Quality," The Journal of Political Economy 100 No. 1 (1992): 84-117. Hanushek has also found that highly effective teachers can improve future student earnings by more than $400,000, assuming a class of 20. "The Economic Value of Higher Teacher Quality." National Bureau of Economic Research. Working Paper 16606 (2010).