In the U.S., there are strict laws in place on the treatment of pets and lab animals. Abusing an animal is normally punishable by law.
Yet, it is legal for farm animals to be kept in conditions would be considered "abusive" for pets and lab animals.
I know that there is a clause somewhere stating that anything that falls under the category of "common farming practices" is exempt from animal welfare laws. I'm looking for this clause and any documentation that explains it.