Please help

My friend bought 2 grams of MDMA and we tested them for fentanyl. 3 positive tests in a row. We triple wrapped this shit and now we’re trying to figure out how to get rid of it. Honestly, I would turn this in to the authorities if we weren’t gonna get in trouble for it ourselves. The dealer says we can give it back, but on top of the fact that this sounds like a set-up, even if he did take it back, he’s just gonna endanger somebody else life.

When I confronted him about it he basically told me I don’t know how to test my drugs and that I’m wrong. I definitely DO know how to test my drugs. False positives are rare, but 3 false positives in a row is just unrealistic. I don’t know how you can live with a clear conscious when you’re selling laced shit.

Anyways, we’ve chosen to take the loss and just get rid of it. So please, how should we get rid of it???