1.2 Trends in numbers of persons implicated in offences, police custody measures and persons imprisoned Source: État 4001, Ministry of the Interior, ONDRP after 2009 / CSDP 2015-2017 Report, series B. Aubusson. Field: Crimes and offences reported to the State Prosecutor’s Office by the police and gendarmerie (apart from traffic offences). Bad cheques are also excluded for reasons of homogeneity. Mainland France Note: When counting persons involved in criminal activity or an offence in police investigative procedures ("persons implicated"), one single person may be involved in any one year for different cases and counted several times. For police custody, the charges decided upon are counted (there being the possibility of a number of successive charges for one single person in a case). The source excludes implication for contraventions, driving offences and contraventions uncovered by the specialist services (customs, work inspection, fraud investigation etc.). The "Persons imprisoned" column shows the decision at the end of the custody period, the majority of measures resulting in release followed or not afterwards by court proceedings. The persons "imprisoned" have, by necessity, been presented before the court at the end of custody (brought before the court) but not all of the referred accused are then imprisoned by court order. The State Prosecutor’s Office or court may decide to free the accused. Counting those imprisoned in police statistics presents a few problems; in some police jurisdictions, all referred accused are counted or have been counted as imprisoned since the investigating police department does not know the results of the appearance before a judge or public prosecutor and possibly the court appearance where individuals are held by another department (when a case is filed before the courts). It is however surprising to see existing, at criminal investigating department level (national police and gendarmerie) the collection of statistical information relating to criminal justice. But for the time being there are no equivalent statistics at public prosecutor level. 149