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Someone in your situation can TRY to request it formally. Under New Jersey's open records law (see HERE), a request in WRITING may be made for any record held by a government agency, although there is a number of exceptions.
"Government record" or "record" means any paper, written or printed book, document, drawing, map, plan, photograph, microfilm, data processed or image processed document, information stored or maintained electronically or by sound-recording or in a similar device, or any copy thereof, that has been made, maintained or kept on file in the course of his or its official business by any officer, commission, agency or authority of the State or of any political subdivision thereof, including subordinate boards thereof, or that has been received in the course of his or its official business by any such officer, commission, agency, or authority of the State or of any political subdivision thereof, including subordinate boards thereof. The terms shall not include inter-agency or intra-agency advisory, consultative, or deliberative material.
You can see a sample record request letter HERE.
However, if the matter is under investigation, then the police can deny access to ongoing criminal investigation's material. If you feel the denial is improper, you can appeal the decision to the Court via a Writ of Mandamus and the Judge will decide.
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