Confidential Drug Rehabilitation

I was wondering if anyone could help me? I am 100% sure I was fired last week because of statements made by my former employer to my THEN current employer. My current employer knew many things he could not have known without speaking to my former manager. For example my then boss know all about my stint in rehab which was several years ago! He also knew about a demotion that I was forced to take, and a written warning I received etc etc. My question is there any way I can prove that my former company slandered me to the current company??? If so how??? PLEASE HELP!!!!!!!!!!

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When one of our employees fail a drug screen our boss fires them and then tells everyone why. Could we be sued for slander?
The employee in question had a false positive. She’s taking a prescription that can yield a false positive. She has a note from the pharmacist stating that. But the boss is still telling people she’s a pot head.

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