It's possible. I'm an avid milk drinker in the US and can't recall ever having seen milk without the rBST free label. You might have to buy like dollar store milk or something to find it haha. Sounds like maybe 10-20% of US milk might have rBST.

Interestingly it is not illegal to import milk produced with rBST into Canada and Google says there are no specific labeling requirements for imported milk. But that's been a thing since 2015 apparently.

So good news everyone, you may have already been drinking hormone and antibiotic infected milk already for the last 10 years in Canada if you haven't checked the label. TIL.