Conversation so far:
when was corporal punishment outlawed in the us
As of 2018, corporal punishment is still legal in private schools in every U.S. state except New Jersey and Iowa and legal in public schools in nineteen states.
what was the court case regarding the practice of corporal punishment
The practice was held constitutional in the 1977 Supreme Court case Ingraham v. Wright.

Question: why was the practice declared constitutional
Self-contained rewrite: why was the practice of corporate punishment declared constitutional