Administrative / OSHA
Presumption of hazard properly attaches in initial safety proceedings, as de minimis risk is an affirmative defense later on.
Substantial evidence for agency's abattoir citations.
Agency considered violation of a key projecting at the end of a shaft as being that of a projected shaft. The correct regulation is that regulating keys.
http://www.ca5.uscourts.gov/opinions/pub/15/15-60215-CV0.pdf
Since 2011. An occasional commonplacing of the U.S. Circuit Courts of Appeal.
Neither an authoritative statement of the law nor legal advice. Quick work.