How do you sue for slander?

Question Details:

An acquaintance of my husband has been telling people that I am having an affair with him and I am on drugs. These rumors cost me my marriage. Of course, my husband believes what he is hearing because he doesn't think that someone would lie about something like this if it wasn't true. I want to prove to everyone these are vicious lies. I want to take a drug test and make these rumors stop. Important Notice