"I'm not looking to charge any teachers, I've got enough work to do."
Bullshit. That's exactly what he just threatened to do by sending those letters.
Teachers are in a very tough position, especially now that they are being threatened with arrest if they do what the law requires of them. This guy has a political agenda that is in opposition to the law. He is intimidating teachers into violating the law because of it. He is corrupt and doesn't deserve to be a district attorney.
Some quotes from his letter (via TFA)
"If a teacher instructs any student aged 16 or younger how to utilize contraceptives under circumstances where the teacher knows the child is engaging in sexual activity with another child -- or even where the 'natural and probable consequences' of the teacher's instruction is to cause that child to engage in sexual intercourse with a child -- that teacher can be charged under this statute" of contributing to the delinquency of a minor. ...
"Forcing our schools to instruct children on how to utilize contraceptives encourages our children to engage in sexual behavior, whether as a victim or an offender," he wrote. "It is akin to teaching children about alcohol use, then instructing them on how to make mixed alcoholic drinks."
Note the second quote where he is clearly proselytizing against the law. This is completely inappropriate for a district attorney.