The use of narcoanalysis by Polish counterintelligence in the 1930s

From Introduction: "The initial idea of using narcoanalysis for investigation purposes arose soon after surgeons began using narcosis (sedation) to induce sleep during surgery. There are four phases that a patient goes through in general anaesthesia (e.g. with ether or chloroform): the state of shock or analgesia (stadium analgesiae), the state of delirium (stadium excitationis), the state of surgical anaesthesia (stadium anaestesiae chirurgicae), and the stage of respiratory arrest (stadium asphycticum) (Danysz, Gryglewski, 1982)."(...)