MTA has got a strong union.....
An employee told me a dude was driving a subway train drunk (possibly injured others, I can't remember all the details), was suspended and eventually got their job back.
Yup medical too along with teacher
I've heard the same stories
Drugs, sexual misconduct (before #metoo), drinking, etc
The ones you CANNOT SURVIVE?
Theft, withholding work, lying on paperwork, felonies, any stuff messing with kids, endangering patient care, HIPPA, messing with someone who has special needs, stuff like that.
And right now you don't want any racial issues.