Yes. Joint investigation teams between national and foreign police agents, set up in a cross-border crime context, in order to carry out difficult investigations requiring important means in several Member States, and demanding for a coordinated and concerted action in such Member States. Measure with a precise objective and limited in time, with the possibility of prolungation. Scope: in practice: criminal offences with any of the above mentioned criteria. Alternative measures: Assistance from the authorities requesting that a rogatory letter is carried out.