First step in being "credentialed" in California is to take the CBEST Test. This tests COLLEGE GRADUATES at a 10th grade reading level. Best thing to do for public education is to ban teacher tenure, ban teacher's unions, and shutdown teacher's colleges.
This is alot of talk about nothing. Vast majority of teachers in my state are not certified in all areas they teach; required by No Child Left Behind. Emergency certifications have been around forever. Bottomline is that new prospective teacher must have degree in say math or science, pass Praxis II area certification for feds and then start at 34 grand/year. You are not going to get alot of takers in high crime urban areas where the teachers are needed.
Double beginning teacher salaries and you will get highly qualified people, but that will never happen; unless prop taxes triple.
Most teachers leave teaching after 10-12 years, they burn out. They top out on pay scale and still get out of teaching. Teach for a few years and you will understand why.
Just more politics as usual.