In Amsterdam, you can test it for free. It's strictly speaking illegal, but in practice, the government doesn't prosecute these things as they try to attack it

In Amsterdam, you can test it for free. It's strictly speaking illegal, but in practice, the government doesn't prosecute these things as they try to attack it from the supply side and try to protect the consumer side. So you buy some MDMA, take a bit from it, bring it to the lab, get it test for free, and presto! The only risk is financial risk. Disclaimer: I've never done it, I've only see some (probably state-sponsored) videos on it.