Is this a choshen mishpat or Yoreh Dayah issue?

As is well known, people have their kashrus preferences in the meat and poultry they eat.

If your butcher department carries also the brands that you do not use, yet he uses the same uncleaned tables, knives, grinders, slicers, etc.

So in essence you are getting THE LOWEST COMMON DENOMINATOR!

Make sure you ascertain in advance what brands they carry and process.

A " Sefardi" would have those issues as well re: Bet Yosef.

We recently became aware that Kosher West starting using, processing AGRI, etc.