In this case, the answer falls within the practice of profiling: the first contact is more likely with young people who are also involved in a a greater number of infractions. A first contact is also more likely for those who have friends who have had prior contacts, that is, who are part of a community that is watched, part of that subpopulation of "permanent suspects", and for those who spend too much time on the streets who are also those belonging to lower social class sectors.
En este caso el primer contacto tiene relación con mayor número de infracciones por parte de los jóvenes, tener amigos que han tenido contactos previos, es decir, ser parte de una comunidad vigilada, parte de esa subpoblación de "sospechosos permanentes" y el hecho de estar mucho tiempo en la calle, siempre y cuando se pertenezca a sectores sociales más bajos.