No dairy was consumed during the paleolithic era, so it's not really paleo.
This is where the stupid comes in with the whole paleo thing. Nothing against a balanced diet, but the reasoning behind this one is so - woo woo.
It's like the literal word of the bible thing, if you are following it you're doing it wrong. Follow the spirit, buy raw foods dont buy pre mixed or processed crap. think even just that is a great win for most folk.
I follow a two hand rule when im unsure. I'll explain :- Has the product passed through more than two different companies/grocers/plants before reaching me? If yes, it can fuck off. I'm lucky to be in the middle of farm lands so I can buy direct from farmers, or first hand from farmers markets, or second hand from some grocers who source from companies that deal with farmers. It's when you get to chit like people catching the crap that fell off the barrel after the third guy down the line has already molested it that it becomes really worrisome, but thats the standard for most.
Even if first hand, I'm also not gonna buy chit like corn fed animals, it's just about becoming more aware of what you eat.