In cases involving the simple tracing of telecommunications (activated mobile terminals, for example), the requisitions for this measure can be carried out by police officers without an order from a magistrat (judge or prosecutor).
Tracing of telecommunications and other forms of electronic communications can also refer in french law to the routing data of an established connection, and more specifically traffic and location data. Connection data includes:
- the dates and times of the beginning and end of the connection ;
- the characteristics of the subscriber's connection;
- the identifier assigned by the information system to the content or object of the content creation operation;
- the nature of the content creation operation;
- the dates and times of the operation;
- the identifier used by the author of the operation when possible.
Those investigation techniques exist in french law under article 60-1-2 of the Code of criminal procedure.
Requests for connection data are only possible on two cumulatives conditions: the procedure requires it and it meets one of the following situations:
- the procedure concerns a crime or an offence punishable by at least 3 years imprisonment ;
- the procedure concerns an offence punishable by at least one year's imprisonment committed through the use of an electronic communication network and the only purpose of these requisitions is to identify the perpetrator of the offence;
- the requisitions concern the victim's terminal equipment and are carried out at the victim's request in the case of an offence punishable by a prison sentence;
- the requisitions are made in the context of a procedure to search for a missing person or to follow a criminal.
The public prosecutor (in the context of a police investigation) and the investigative judge (in the context of a judicial investigation) may request connection data from the Electronic Communication Operators (ECA) in order, for example, to receive the list of incoming and outgoing calls as well as the cells activated on one or more lines relevant to the investigation in progress.