I think from an ED perspective it would be a bad habit to get into sending patients home with narcan autoinjectors, with the obvious reason being, if you think they're at high enough risk that they could go home and die needing narcan, then it would obviously be better to admit them. But I think you're talking about those refusing to be admitted after a narcan dose. These patients put everyone in a terrible positing creating terrible dilemmas. There are few easy answers. Narcan home injectors are out there.
Interestingly, there is a movement now for doctors (PCPs, Pain) to send their high dose chronic opiate patients home with narcan autoinjectors.
http://projectlazarus.org/patients-families/what-naloxone
I personally have mixed thoughts about it. I feel that from the perspective of those doctors managing patient's chronic pain medicines, if you're about to click on the "narcan autoinjectors" button on the EMR, that probably should be a brain queue to go back and un-click the high-dose opiate button and consider taking your patient
off the drug regimen you think could kill them. At the same time, I realize we've inherited a legacy generation of patients on ridiculous regimens of high dose opiates that we have to deal with, many of whom have legitimate problems making these dilemmas very difficult to solve easily, and that policies like this could possibly reduce accidental ODs from a public health policy perspective. I wish I had easier answers for these dilemmas.