No. In individual cases they still do challenge the reliability, very much so. In fact, they have full-blown jury trials on this stuff in the U.S., but on a case-by-case basis. That's where the American defence part takes a run at the reliability of this. It is not to say the law is unconstitutional, but the application in each case simply isn't sufficiently reliable.
I don't know if I'm making my point clear.