Possession: The actual, physical Possession , or the constructive Possession (which shall be found only if the Person has exclusive control or intends to exercise control over the Prohibited Substance or Prohibited Method or the premises  in which  a Prohibited Substance or Prohibited Method exists); provided, however, that if the Person does not have exclusive control over the Prohibited Substance or Prohibited Method or the premises in which a Prohibited Substance or Prohibited Method exists, constructive Possession shall only be found if the Person knew about the presence of the Prohibited Substance or Prohibited Method and intended to exercise control over it.