Took searching up a few articles, but this one gave the most detail on how this was achieved.
It sounds like a mix of more modern detective and surveillance work, but all articles I read also mentioned a strong initiative to bring community involvement into the equation. Getting the nearby residents to pay attention and care more for the animals and to speak up to help the patrols seemed to be a constant theme in the official statements.
I’m happy they achieved such positive results. There was a proposal that did not pass to remove all the horns to deter poaching, which I feel conflicted about, and it’s wonderful they were able to stop the poaching without resorting to that.
My girlfriend deciding she thought getting the mail everyday was something exciting has oddly been one of the more positive changes in life recently. To come home and just have one piece of mail that is actually necessary sitting where I put my work backpack and not have to even see all the other junk is a much better experience.
I try hard to reduce my trash and recyclables, and it always depressed me to throw >90% of my “mail” right into the recycle box.