I'm a little familiar with that sort of testing. The prelim test just tells them that a drug could be present. The confirmatory test tells them if the potential positive is really a drug of abuse or not. Seems like a legal thing here & I'm not an attorney. I hope you can find something else soon.

I'm so sorry that happened to you, Brian - are you currently looking for work now? Let us know what to keep an eye out for so the community can help!