Quote Originally Posted by esh147
I had version 5.7, the batch is 7400832001.
And for a lab ua if they detect that it is a substitution then it is considered inconclusive, and they consider it a refusal to give a sample, thus fail.
Did your boss actually tell you that he believed / assumed that you had used a substitution?
Or did he only state what you described in your original post i.e., "the test was inconclusive so [you] failed."

You said you have worked for this employer for 9 months, right? So, I would think there is already a good enough relationship there that your boss would want to try to give you as much explanation as possible, right?

I just used this Quick Fix (same version and batch number) for a pre-employment screen. They accepted for temperature. otherwise, I will post as soon as I hear back about the results.
But, as much detail as you can provide for us regarding the information from your boss and reasons for your being fired would be really appreciated.