Can I bring an action against my previous employer for the actions of one of their employees?

Question Details:

I worked for a company and was fired for failing a THC drug test. Since then I have gone to work for another company and have found out that one of the salesman from my previous employer has been telling customers that I was let go for failing a thistest. This information is supposed to be private as far as I know, so anything that he may have heard is either rumor or it was talked about at work. Is that invasion of privacy? I have at least 1 customer who is willing to provide an affidavit and maybe more. Can I bring action against this employer to at least stop, if not reverse, the damage that has been done?

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