A while ago, we discussed the stupidity of a Massachusetts proposal to tie teacher licenses to teacher evaluations. Not employment at a particular school, but the ability to teach anywhere.
Good news: the state pulled the proposal.
Again, it’s worth bringing up this troll-be-gone: yes, there are bad teachers, but the massive test score performance differences based on socioeconomic group can’t primarily be laid at the feet of teachers. If you think a wildly-unreliable and punitive evaluation method will encourage people to become teachers, you are out of your mind.