It was admitted not in common law but in civil law that police is qualified as a witness, who can testify in court.
无论是英美法系国家还是大陆法系国家，都承认警察具有证人资格，应当出庭作证。
A witness qualified as an expert by knowledge, skill, experience, training, or education, may testify thereto in the form of an opinion or otherwise.
那么满足作为专家要求的知识、技能、经验、训练或者教育的证人就可以专家意见或者其他形式作证。
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