Does my employer have to keep my drug test screening confidential?

I recently failed a urine screening, I was immediately suspended without question, with no definite return date. I 100% believe my test is a false positive. There are numerous people (6 that I know off) in my company who have knowledge of my failed urine & for what drug. I have worked for this company for 14 years (13 years in the past & 8 months presently). During those 14 years, I was probably tested 25-30 times and never failed. I passed the pre employment drug screening 8 months ago. They obviously know me and my history but still rushed to judgement. I feel they are ruining my reputation. I offered to retest on the spot and they refused to let me. I'm in the process of fighting the results and trying to have the original sample retested. Do I have any other rights? I live in Pennsylvania and my employer is in New Jersey.