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Found this --



http://members.aol.com/statutesPA/18.Cp.35.html

§ 3503. Criminal trespass.



(b) Defiant trespasser.--

1. A person commits an offense if, knowing that he is not licensed or privileged to do so, he enters or remains in any place as to which notice against trespass is given by:
   (i)actual communication to the actor;
   (ii)posting in a manner prescribed by law or reasonably likely to come to the attention of intruders;
   (iii)fencing or other enclosure manifestly designed to exclude intruders;
   (iv)notices posted in a manner prescribed by law or reasonably likely to come to the person's attention at each entrance of school grounds that visitors are prohibited without authorization from a designated school, center or program official; or
   (v)an actual communication to the actor to leave school grounds as communicated by a school, center or program official, employee or agent or a law enforcement officer.
2. Except as provided in paragraph (1)(v), an offense under this subsection constitutes a misdemeanor of the third degree if the offender defies an order to leave personally communicated to him by the owner of the premises or other authorized person. An offense under paragraph (1)(v) constitutes a misdemeanor of the first degree. Otherwise it is a summary offense.