Questionnaire Germany

II.7 Which law empowers the executive to give an instruction not to prosecute?

Sect. 146 of the Court Organisation Act (Gerichtsverfassungsgesetz) generally declares that officers of the prosecution service have to carry out orders of their superiors. Instructions not to prosecute can be given but are binding only insofar as they are within the bounds of procedural law; even the Minister of Justice cannot stop a prosecution when it is demanded by the principle of mandatory prosecution, e.g., in cases of felonies (Verbrechen). It should be noted that the authority of the Minister of Justice extends only to orders to refrain from prosecution, not from investigation; if there is a suspicion of criminal conduct, the prosecutor’s duty to investigate is absolute (sects. 152, 160 CCP) and cannot (legally) be abrogated by ministerial orders.
The German text of the statute can be found in http://bundesrecht.juris.de/bundesrecht/gvg/index.html