Find a different hook, ASAP. Drug testing (reagent test kits) sites include testsure.com and testkitplus.com. I also recommend stocking up on fentanyl test strips, having naloxone on hand, and having someone around when you're using that is sober. Yes, I am overly cautious, that's why I've been a HARM REDUCTION forum member for over 11 years.
These assholes pressing bars in their filthy trap houses don't give a FUCK about you. There could literally be anything in them. Addiction sucks. I've been in it for 21 years and had my share of pressed pills. I blocked those dirty plugs, found legit ones and never looked back.
Stay safe and trust your gut. Welcome to Bluelight.