The actions that the observing officers are permitted to carry out, while complying with the law of the contracting party on whose territory they are conducting the observation, exclude, in general, any coercive actions. Thus, while they can make various observations, they can conduct surveillance (i.e. following/"tailing" a person or persons), take photographs, gather spontaneous statements or seize items which have been provided on a voluntary basis, they are not permitted to conduct telephone intercepts, to enter places of residence or places that are not accessible to the public or to question or arrest a person who is the subject of the observation. The questioning or the arrest of the person who is the subject of the observation can only be carried out by the French authorities.
French officers conducting observations in foreign countries are officers and investigators of the judicial police, of the national police and of the national gendarmerie. In addition, customs officers who have obtained an authorisation in advance from the public prosecutor can exercise this right within the parameters of a judicial investigation relating to the trafficking of drugs, arms or explosives or the illegal transporting of toxic or hazardous waste.