Walter, passing the Praxis I & II and then following with continuing education credits is not enough when you consider that teachers are shielded from personal liability for their job performance.  Unlike professionals in the private sector that take licensing exams and then follow up with continuing education, (think lawyers, doctors, and engineers) they are subject to malpractice based on the quality of their work.  A teacher that harms a student by ineffective application of teaching skills should be personally held accountable for every student that they harm, without any personal shield from financial liability.  Judging the important of their position, teachers should be subject to drug testing.  Just a random snip of hair once every school year should clean out some of the worst offenders.  The bottom line is that if teachers are going to be shielded from personal liability for their teaching, then they should be annually tested for performance, knowledge,  and drugs.