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