Mary Jane BUYS WHAT SHE BELIEVES IS A DIME BAG OF MARIJUANA FROM ALICE B. TOKLAS. IN FACT, THE BAG CONTAINS OREGANO. Mary Jane IS ARRESTED UNDER A STATUTE PROSCRIBING THE KNOWING POSSESSION OF NARCOTICS. DOES THE FACT THAT THE SUBSTANCE WAS OREGANO MEAN THAT MARY JANE HAS NOT COMMITTED THE PHYSICAL ACT OF POSSESSION?