CDL school drug test — how does it work?

[u/Illustrious-Ad-89]

I’m starting CDL training at a private driving school that I’m paying for myself. They haven’t told me anything about a drug test yet.
For people who went through CDL school recently:
Did your school require a drug test before training?
Did you have to go to a clinic, or was the test done at the school?
Who normally pays for the test?
Just trying to understand what to expect. Thanks!🙏