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.