Established companies with decades of grading experience haven't been able to do it.
But newer companies tend to have large amounts of magic pixie dust on hand.
This is purportedly part of a transcript of a discussion recently overheard by their management
Suit #1 - Some magic dust?
Suit #2 - Yeah, magic dust, y'know? We give a little bit to one grader, a little bit to another grader, a little bit more for the lead grader, a little bit more...
Suit #1 - And this will give us great TaT, man?
Suit #2 - Aw, great TaT, man?!? Are you kidding, man? We'll have the fastest TaT in da world, man!