Extra codes always have three characteristics which connect with one another, namely: (1) greater concreteness and dependence on context; (2) a lesser capacity for social legitimation, and so also less 'presentability'; and, therefore, (3) for their functioning within the system, dependence, in special circumstances, on sensitivity, knowledge of the milieu, knowledge of history, trust and (!) mistrust, which are not shared in their environment.

Niklas Luhmann, Trust and Power, loc. 660