What do you know about using public domain celebrity photos?

PLEASE READ THE ENTIRE QUESTION BEFORE ANSWERING; PLEASE SITE YOUR REFERENCE FOR YOUR ANSWER.
It's important to remember that anyone can sue anyone at anytime for anything. They may or may not win depending on the strength of their case. What I want to know is, "Is using public domain celebrity photos illegal, eventhough the sites say you can use them?" (I'm not talking about using them for profit.)
 
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