Posted By:
Mattking - good question. They don't explicitly talk about PL in their scale. Here is a selection that could be interpreted as talking about what some would call PL:
"A PSA NM 7 is a card with just a slight surface wear visible upon close inspection."
While the meaning there is certainly ambiguous, I would suggest that all the examples we see of them grading a card with PL higher then a 3 suggest the rule, not the exception.