Continued Early BPD History
The 1920s

      Lie detector

 The “Cardio-pneumophychogram or Lie Detector was developed by City of Berkeley Police Officer John Larson after a suggestion by Chief August Vollmer to create a machine that would detect lies. This photo was taken around 1923.

**The rich depth of BPD's History is being compiled and reviewed thoroughly for posting "By The Decades."