The U.S. Occupational Safety and Health Administration doesn't investigate farm deaths, like Brandon Mullen's in Iowa in 2013, because of a fateful decision by Congress more than 40 years ago that has given small farms unique immunity from safety oversight. A Fairwarning.org report.
Limited Occupational Safety and Health Administration enforcement and coverage favors large farms, leaving the rest on an honors system in which dangerous farm practices fly under the radar until a serious, and often fatal, injury occurs.