I'm only posting this because they are the largest third party authenticators.
Their credibility in the sports card world is quickly burning in flames. All this started with some collectors breaking open several card trimming rings who were getting thousands of altered cards graded by PSA.
Now it's been discovered that a former employee at Beckett Grading has been receiving a statically impossible number of Perfect grades from Beckett.
It appears, as many of us have always suspected, that if you're a big customer or have an "in".. you get whatever you want.
I've never put much faith in third party autograph authentication. But I am now quite certain that Beckett and PSA are either competently incompetent or downright corrupt (more likely the latter)
It's a sad state of affairs.
https://www.blowoutforums.com/showthread.php?t=1297069