COCAINE

My sister's fiance is an occasional cocaine user. Every six weeks or so, he disappears for a few days to binge. As if this isn't bad enough, he insists that it isn't damaging to his health. Regardless, it's damaging to my sister and their one year old daughter. My sister believes everything that he tells her about the "harmlessness" of cocaine because he's a pharmaceutical rep. She also believes him when he tells her he'll stop even though he's been doing for the last twelve years. I need concrete proof to show her.
I welcome all the advice and info people have and I've posted this on other boards for maximum responses.

Thank you all in advance.
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