Sheila Haennicke’s son was on a Blue Line train in Chicago when he overdosed on fentanyl. The only thing that might have saved his life in the five minutes it took for the ambulance to arrive is naloxone, an emergency opioid overdose reversal treatment.

In the wake of her son’s death, Haennicke is part of a growing movement to make the nasal spray, commonly distributed as Narcan, available near public transit.