People are using a chemical used to calibrate machines to get high that is so powerful it’s nearly Narcan resistant.

Some dealers are passing off this new drug as fentanyl. But the reality is much worse. It’s a hazardous chemical mixed with fentanyl called tetrahydrofuran fentanyl.

https://www.abc15.com/news/national/new-drug-nearly-resistant-to-narcan-kills-milwaukee-man