fkm, I can trust the volunteers and experts in HKBWS because I know they have the experience and knowledge to handle these trapped birds. I don't know about other part of the world but I am sure you still need a license to do the same??
There is nothing wrong with wanting to know, but I think next time you can use a more forgiving use of words...it just sounds like you think all the researches are wrong.
It is not easy to identify some birds even on hand, some birds are just so tricky to identify. As I say, even experienced birders can get it wrong sometimes. Books are just for reference, there are bound to be some mistakes in them. If you look at older birdguides, I am sure you will find mistakes in them. There are so many things still unknown to us in this natural world, this is why researches are so important.