Police forces collect information to be used in a public court to get people convicted. Security services gather information that does not necessarily lead to people being prosecuted and in many cases needs to remain confidential.
警方收集信息，以便在公共法庭上定罪。安全部门收集的信息不一定会导致人们被起诉，而且在很多情况下需要保密。
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Security
Services