Yes...it does happen.
For example, HR now runs my (non-union) company. Do you know how much ammunition I have to submit to get someone terminated for underperformance?
It's no different.
Considering I work in HR from a Systems perspective, I can relate.
There certainly is documentation requried to layoff an employee for underperforming. But after the documentation is gatehred, the employee is let go. with a teacher, and correct me if I am wrong, after the documentation si gathered are they not allowed to go before the rights board for kind of a second chance? Or is the rights board part of the documentation gathering process?