Having knowledge and control can be proved if the item was found on you, another person, or any place, and you knew what the substance was and had some measure of control over it. For example, if you’re arrested carrying your friend’s bag contacting a baggie of cocaine, you’re in possession, yet there’s no possession. In this scenario, you are in physical possession of the drugs, but you did not know that the substance was in the bag or what it was. As such, the knowledge and control elements cannot be proven, which means that you cannot be properly found guilty of possession. In constructive possession, i.e., where the drugs are not found on you, the prosecution has to prove that you had both knowledge and control over the seized drugs.