Why is determining whether a defendant is insane difficult?

Complete the paragraph..It is difficult it determine whether a defendant is insane because somebody can fake insanity to evade trial. During this period, someone can modify their behavior to ensure that tests prove that they are incompetent for trial (Cetv, 2006)………Cetv (2016). Competency to Stand Trial. https://www.youtube.com/watch?feature=player_detailpage&v=pl5XHwAaAJM

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