I recall reading that whenever a grader assigns a psa 10 grade to a card, that card is passed onto a second grader to also confirm that the card deserves a 10.
Can someone confirm this is true or likely? i’m not sure whether i’m just remembering things or what i read was legitimate.
Secondly, does anyone know how many staff grade pokemon cards down at PSA?
summoning @garyis2000 a.k.a Mr PSA 
The process that many people have said before is;
Grader A grades the card, enters the grade into the internal system.
Grader B grades the card, enters their grade into internal system.
If both grades match, card goes off for encapsulation. If grades do not match, grader C steps in and assigns final grade.
No grader has access to what any other grader has given the grade.
interesting. thanks for your input.