Harold probably read it on Tanith Tyrr's site. Tanith is one of them people that go all out for the reptiles. i am not joking she has rescued more venomous snakes then anyone I know.
here is her site
Tanith Tyrr
Snake Getters
www.snakegetters.com
I know her vet did the research surgery and put out that it is not as easy as some say. and gland can be missed.