Question: What is the so-called “fentanyl footprint”?
Answer: The so-called “fentanyl footprint” is “clusters of overdoses and overdose deaths occurring within a small geographic area within 48-72 hours”. The “fentanyl footprint” may provide a clue for first responders that a given drug over dose could be related to fentanyl or fentanyl related substances. (US DEA. Fentanyl Briefing Guide for First Responders. https://www.dea.gov/index.shtml)