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.