Just like I do now. I look for milk labeled "pasteurized" and make sure it's from a trusted vendor/brand or has a trusted certification.

There's a competitive advantage to labeling food, and there's no stopping companies from labeling food in the absence of food labeling regulations. The most trusted organic certification is from a for-profit certification company, Quality Assurance International. McDonald's published nutrition information before it was required by any law. Intentionally incorrect labeling is already covered by fraud and tort law.