Not any particular law, or even the law of a particular country or place, but just Law in general. It works this way even if the actual speaker should have nothing to do with the real law, or have any real authorisation to stop and query me. And I am not alone. Other people on the street here with me also react to the call, in ways which may be quite different from mine. All of us are strangers, going about our own paths through the city, without the slightest coordination or knowledge of each other and our separate doings, but we all react to the call.
Interpellation is doubly phatic.
This is the position which the individual who turns at the call in the street is offered, the role she or he is invited to recognise her- or himself in. It is associated with the conative function. This is the position of the Law, and is associated with the expressive function. As a role, it should be carefully distinguished from any actual person who might do the calling. This relationship is that of a community of interpellation.