In Taken, just after Bryan Mills tells Jean-Claude ("Deputy director, Internal Security") that he's not going to give up and go home, he learns from the girl he rescued from the construction site that a place of interest is behind a red door on Rue de Paradis.
He goes there and immediately inveigles himself all the way to the room where all the bosses are sitting, by suggesting that he is a representative of the authorities that they are paying to allow their activities to continue relatively unhindered.
He then proceeds to identify the person he had spoken to on the phone at the point of abduction, and wreak some havoc.
My question is, how on earth did he know that such a ploy would work? There is nothing I can see in his previous (two, short) conversations with Jean-Claude to suggest that this is happening (I found a badly-formatted but apparently faithful script online). Are we to suppose that his experience led him to realise that such an operation would require complicity? Or is there a deleted scene that shows how this became clear?