I would love to have the money to buy all the parts for this. There’s even an instructables with detailed instructions. I think it would be able to carry a taser, speaker and microphone, and ai enabled camera to detect a gun while at it’s charging station.
https://www.thingiverse.com/thing:2004357
I found a bunch of drones not labeled for commercial use, but free to make for personal use.
It might be required to buy carbon fiber frames if PETG is not strong enough to withstand repeated landing and flying. Also, I think with a fancy printer you can print carbon fiber. I have a Crealty Ender v3.
I also found a subreddit where they mentioned carbon fiber frames.
https://www.reddit.com/r/diydrones
I subscribed to this subreddit.