I don't know of any, and that's a good thing. PAs perform several needed functions.
Most PAs can take care of specimens that are not very educational to gross, such as GI biopsies, cervical biopsies, EMCs, etc. Good PAs will also be able to handle frozen sections, grossing larger specimens.
The best ones are those who have been in the field for several years and can handle anything, help residents out, etc. During my PSF, one of the PAs had just gone on maternity leave, so there were some days I worked where there was no PA coverage at the hospital I was at, so I had to spend several hours doing all the skin biopsies, transferring every small polyp and prostate core from jar to cassette, and all that. On the other days the PA and I would work together, doing all the frozens and large cases. And I could spend a lot of the day looking at slides because she took care of all the little stuff. UMass now has 3 PAs so I don't even know if residents have to deal with little stuff unless it is a weekend or too late.
I can imagine there are programs that don't use PAs, but I doubt they have any significant volume. Some programs may not use PAs, but have histotechs or other auxilliary staff taking care of small biopsies.
Any program without a PA = Big red flag, in my book.