Complaint is a document that starts a suit. A summons is a document that calls a defendant to court. A police report is a report made by a police officer.
New Jersey Court rule 3:2 further addresses summons and complaint as well as what has to go into each. Here is the link to the judiciary website: http://www.judiciary.state.nj.us/rules/r3-2.htm
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A police report is the officers official version of how an accident took place or other incident. A Summons and Complaint is the beginning of a lawsuit either in the Criminal/Quasi Criminal or Civil Process.
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