Can I sue a co-worker for slander?

Question Details:

A co-worker went to my boss and said I was trying to buying drugs on company time. This is not true. The co-worker said a third party (a customer of mine) told him that I was trying to buy his oxycontin from him. This co-worker has a grudge against me because of a demotion he received; he blames me for it. Also, the same customer involved is involved in a dog bite case with me; his dog bit me at his home while I was on the job.

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