Adatto investigated the effects of intravenous sodium pentothal on fifty criminals considered insane. He found that his patients talked more freely when under the influence of this drug. He also observed that some patients had a recurrence of their delusions and hallucinations under narcosis while others could deny delusions in this state. Three of the fifty patients fabricated new stories while under the influence of the drug—which contradicts the popular 'truth serum' idea. Almost all the men spoke with great affect about their parents, and frequently the nature of their relationship to the parent and the nature of the crime could be connected. Adatto concludes that the use of intravenous barbiturates is helpful in studying criminals, particularly since it aids in breaking down resistance and helps in establishing a predominantly positive transference.