In Anglo-American countries, there is a famous legal maxim : Justice must not only be done , but must be seen to be done . In order to realize this sort of visible justice, police often appear in court as prosecuting witness to give assistance to public prosecution at the request of the public prosecutor . In some special cases , police even enter an appearance as defense witness to provide testimony . Based on the thought of superiority of the rule of law , Judges also have the right to summon police to co...
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