Assuming they work like they have in other areas (which I believe they will), some possible impacts:

Health system: Fewer emergency calls & OD responses, meaning fewer people using ambulances & ER beds.

Finances: Save folks from the bills for emergency treatment (or reduce the state's burden if they're on state aid). Lack of hospitalization also cuts down on their sick time use and/or stops them from getting fired for missing work, helping their financial stability.

Personal health: Fewer ODs = more people alive, less scattered needles, fewer needle-transmitted diseases, greater access to resources to get clean.

Ethics: Regardless of your stance on drug use, someone who's using is gonna use. If these places stops some overdoses, it saves whoever would've found their body from having that trauma or discomfort burned into their brain.

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All in all...not a bad idea to explore.