I order my cows by the 1/4-1/2 and always get a good portion of liver also. I would include CAFO liver though if I had no access to my pastured beef. I have eaten it on occasion when my next shipment of cow wasn't due yet and I was out. Its going to have about the same amount of issues as CAFO muscle meat, so if you would eat the meat why not the liver? Your going to require a whole lot less liver for a high nutrient punch. Just thinking toxin/nutrition ratio I say its fine.