This is a bit concerning for me. In the jargon of the science world, 'proof' is not an absolute term. It is not like mathematics where a proof of a statement can be established once and forever. Proof in a scientific sense is more like a process - a process that takes time, often in quantities measured in years - that is never truly
finished.
My worry is that if there is a species that is in real danger, this bill and it's call for proof might cause a intolerable delay in action. After all, they're will always be skeptics. Abuses of the current laws aside, I'm worried that this bill might be causing new problems instead of just fixing the old.
If the species is so fragile that it needs us to protect it. It will go extinct anyway, we are just delaying the inevitable.