Thomas Schwabenbauer 
 Heimliche Grundrechtseingriffe
 Ein Beitrag zu den Möglichkeiten und Grenzen sicherheitsbehördlicher Ausforschung 
  
[Covert Intervention in Fundamental Rights. A Contribution to the Feasibility and Limits of Investigation by Security Agencies.]
 2013. XV, 472 pages.    Summary 
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 The investigative state attempts, in many cases and with completely good intentions, to obtain information about individuals by covert investigation. Thomas Schwabenbauer studies the relative and absolute limits of this quest in the German Basic Law, the significane of privacy for the limits and the role of parliament in view of technological progress.