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18,182 samples completed from 41 states. Last updated Friday, December 19, 2025.
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604012

From Tarboro, North Carolina on December 5, 2025

Assumed to be heroin, fentanyl

This is a messy brew of 5 major substances:

  • caffeine
  • lidocaine
  • 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.

There are a lot of different substances in this sample. We don't know the harms that some of these can cause. Be careful and be prepared for unexpected reactions.

Looks = unknown color, powder

Need free supplies and advice to keep you safe? Find your nearest harm reduction program at harmreduction.org

Major substances in graph:

Peak: 6.85 = caffeine

Peak: 6.98 = lidocaine

Peak: 7.21 = medetomidine

Peak: = 4-ANPP

Peak: 10.08 = fentanyl

Method(s): GCMS

Record for Sample 604012 last updated December 18, 2025