Pretty sure federal law overrules that if you want federal funding for your 9-1-1 program. You're required to follow up on every call to 9-1-1, even if it's just calling the person back or reporting abuse of the service. I strongly doubt calling back to say "lol ur gonna die of ur OD" counts. Lose your federal funding, and your emergency services are gonna cost more than treating drug addicts. And if you let your emergency services go to shit, a whole lot of voters are gonna be very mad after they need them and find they aren't decent and/or don't come in a timely manner.