What are my rights if i was fired due to a drug test that did not conform to proper procedures?

Question Details: I was told by my employer that I was selected for a random drug test. The proper procedures were not followed by the person giving me the test. They told me that I failed it and I was fired. I asked to re-test because I didn't agree with the results. She told me that I was not allowed to as they had split my original sample in half and both samples came back with positive results. I was not offered rehab or anything. Simply fired. Is there anything I can do to get my job back? What are my rights in this situation?

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