William Howard Taft,
Chesapeake Railway Company v. Stapleton…
“ That the state has power to forbid such employment and to punish the forbidden employment when occurring in intrastate commerce, and also has like power in respect of interstate commerce so long as Congress does not legislate on the subject, goes without saying. But it is a different question whether such a state act can be made to bear the construction that a violation of it constitutes negligence per se or negligence at all under the Federal Employers' Liability Act. The Kentucky act, as we have set it out above, is a criminal act and imposes a graduated system of penalties. ”
