CHICAGO (CBS) — A drug overdose triggered a hazmat scare in Ravenswood Saturday.

Around 1:15 p.m., Chicago police found a 29-year-old man unresponsive in an apartment near Damen and Montrose and an unknown substance — later confirmed to be fentanyl — nearby.

Chicago Fire Department teams put on special hazmat gear to go through the crime scene because even a small amount of the drug can be deadly.

Police say the man was taken to Swedish Covenant Hospital and his condition has stabilized.