It’s confusing. What does “free range” mean? Or “organic” or “grass-fed”? If you want to buy meat from animals that have been treated humanely, you need to begin by understanding what the labels mean.
For an easy-to-understand (and enlightening) guide, go to http://www.humaneitarian.org/what-is-humanely-raised-meat/meat-labels/#.Vo7q4hUrKM8. It will give you an idea of how complicated eating humanely can be, and how our thinking is so often manipulated.