Quite often, researches in the field of psychology are made through observational studies. Observational studies are characterized by the observation of a subject under a specific situation. Sometimes, to get accurate results reflecting the truth, it is necessary to use deception. However, such methods can give rise to ethical issues as research participants can sometimes be put under undesirable position, causing them anxiety without their consent. This raises the question: Should researcher use deception in psychological studies? Kant’s ethical rationalism would argue that deception should…