18,182 samples completed from 41 states. Last updated Friday, December 19, 2025.
813935A
From Denver, Colorado on December 9, 2025
Assumed to be fentanyl
3 major substances detected:
- medetomidine
- 4-ANPP
- fentanyl
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 = white, fine, powder
Need free supplies and advice to keep you safe? Find your nearest harm reduction program at harmreduction.org
Major substances in graph:
Peak: 7.21 = medetomidine
Peak: 8.99 = 4-ANPP
Peak: 10.08 = fentanyl
Method(s): GCMS
Record for Sample 813935A last updated December 19, 2025