
Quoting
cdwjava
Some states may have a law that specifically precludes a private person search, but, there is no specific statute that makes it a crime for a private person to snoop inside of another's personal property and there are laws that prevent you from battering others - especially if you have been detained or arrested under the law. Not to mention the fact that using force in the commission of a theft is something we call "robbery" (as mentioned by WhosThatGuy above) which is a violent and serious felony.