I caught my 18 year old son poisoning our dog, what should I do?

So I put up hidden cameras in my kitchen since there would be dishes in the sink when I wake up, and when I reviewed the footage I saw my son with pills and he had cut up hotdogs and stuffed it with pills, I haven't confronted my son yet for killing the family pet and I want to know how I should approach this,... show more So I put up hidden cameras in my kitchen since there would be dishes in the sink when I wake up, and when I reviewed the footage I saw my son with pills and he had cut up hotdogs and stuffed it with pills, I haven't confronted my son yet for killing the family pet and I want to know how I should approach this, since I've never encountered a scenario so disturbing.
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