Science

What are you expecting evidence to be?

I mean if what you wish to prove is that they kill people for their organs, then that. Like one example of that.

If what you wished to prove is messed uo incentive structures, then this suffices.

Showed that the only reason it didn't happen was refusal by an organization member that was so sickened by the experience that this was the last straw and they left the organization.

No it doesn't. It was caught repeatedly before any organs were harvested. The fact that it had to be stopped repeatedly because of insufficient prior checks is the issue.