To spank or not to spank?

In most US states it's legal for teachers and parents to spank. So my questions are
1. Would you ever spank a child
2. If you did, up to what age do you think it's acceptable for you or a teacher to do so

A mom calls 911 to report that her husband is acting erratically after an altercation with the neighbors, but ends up spanking her adult son
To spank or not to spank?
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