List of behaviours that could help identify a sociopath / psychopath, as presented in Cleckey, Mark of Sanity (1941): 1. Superficial charm and good intelligence 2. Absence of delusions and other signs of irrational thinking 3. Absence of "nervousness" or psychoneurotic manifestations 4. Unreliability 5. Untruthfulness and insincerity 6. Lack of remorse or shame 7. Inadequately motivated antisocial behaviour 8. Poor judgement and failure to learn from experience 9. Pathological egocentricity and incapacity for love 10. General poverty in major affective relations 11. Specific loss of insight 12. Unresponsiveness in general interpersonal relations 13. Fantastic and uninviting behaviour, with drink and sometimes without 14. Suicide rarely carried out 15. Sex life impersonal, trivial, and poorly integrated 16. Failure to follow any life plan. Cited through Lies and Liars (Dr. Gini Graham Scott), pp. 28-29 Also from the same book: "(...) while some sociopaths might be drawn...