My son found crystal meth inside an Easter egg during a family hunt. What should I do?

I’m fairly concerned that one of my family members is on crystal meth now. I know its not my mother-in-laws drugs, because she only does ketamine, whippits, and nyquil.
How do I find out whose drugs they are without confronting or embarassing anyone? Or should I just keep the meth and use it/sell it?

Why cant my family go back to the simpler times of hiding airplane bottles of liquor around the house for Easter?

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