604134
From Milwaukee, Wisconsin on January 31, 2026
Assumed to be heroin, fentanyl
2 major substances detected:
- fentanyl
- N-propionitrile chlorphine
But we found lots of contaminants too, with traces of lidocaine + cocaine + 4-ANPP + ethyl 4-ANPP. Trace substances in small quantities are usually harmless, but can sometimes cause health problems. Unexpected sensations may be due to these.
Fentanyl is potent and the amount changes by batch. If you weren't expecting it, consider getting test strips online or from a harm reduction program. Carry naloxone (Narcan) to reverse overdoses. Don't use alone so someone can help if you go out.
Looks = light tan, chunky, powder, rock
Need free supplies and advice to keep you safe? Find your nearest harm reduction program at harmreduction.org
Major substances in graph:
Peak: 10.45 = fentanyl
Peak: 20.77 = N-propionitrile chlorphine
Method(s): GCMS
Record for Sample 604134 last updated February 19, 2026