The case of entrapment proves again that unrestrained power will cause abuse of power easily.It is criticized because it violates the principle of proportionality.Generally,the principle of proportionality includes three sub-principles: the principle of suitability,the principle of necessity and the principle of proportionality.The principle of proportionality has been affirmed authoritatively by the State Council in the policy documents.During the process of realizing the rule of law in China,the principle...