Section 220.25. Criminal possession of a controlled substance; presumption

1. The presence of a controlled substance in an automobile, other than
  a  public omnibus, is presumptive evidence of knowing possession thereof
  by each and every person in the automobile at the time  such  controlled
  substance  was found; except that such presumption does not apply (a) to
  a duly licensed operator of an automobile who is at the  time  operating
  it for hire in the lawful and proper pursuit of his trade, or (b) to any
  person  in the automobile if one of them, having obtained the controlled
  substance and not being under duress, is authorized to  possess  it  and
  such  controlled  substance is in the same container as when he received
  possession thereof, or (c) when the controlled  substance  is  concealed
  upon the person of one of the occupants.
    2. The presence of a narcotic drug, narcotic preparation, marihuana or
  phencyclidine  in  open view in a room, other than a public place, under
  circumstances evincing an intent to unlawfully mix, compound, package or
  otherwise prepare for sale  such  controlled  substance  is  presumptive
  evidence of knowing possession thereof by each and every person in close
  proximity  to  such  controlled  substance  at  the time such controlled
  substance was found; except that such presumption does not apply to  any
  such  persons  if  (a)  one  of  them,  having  obtained such controlled
  substance and not being under duress, is authorized to  possess  it  and
  such  controlled  substance is in the same container as when he received
  possession thereof, or (b) one of them  has  such  controlled  substance
  upon his person.