In New Jersey, the Prosecutor is forbidden from accepting a plea bargain in a case. These cases are very difficult and the evidence rules and reported decisions usually permit the state to introduce records and certain reports. Sometimes if a defendant has an expert report and there are problems with the state's case, the prosecutor can amend a DWI to a lower charge if the state cannot prove the case. However, the expert may also confirm there is no scientific basis to keep out the breath test results.
In addition to your attorney cross examining the state's witness, people charged with offenses can hire DWI experts to testify. These experts are often former state police scientists and troopers. They may be able to review the discovery. Sometimes an expert can prepare a written report for a fee of approximately four hundred dollars to set forth additional errors in the state's case. These DWI experts can also testify if there are problems with the state's case. Experts usually charge approximately nine hundred dollars to testify. Some prosecutors will allow the report into evidence. Other prosecutors require direct testimony. You would be responsible for the expert's costs up front.
The following is the NJ Court Rule on discovery:
7:7-7. Discovery and Inspection
(a) Scope. If the government is represented by the municipal or a private prosecutor, discovery shall be available to the parties only as provided by this rule, unless the court otherwise orders. In the absence of a municipal or private prosecutor, discovery shall be available to the parties in the manner directed by the court. All discovery requests by defendant shall be served on the municipal prosecutor, who shall be responsible for making government discovery available to the defendant. If the matter is, however, not being prosecuted by the municipal prosecutor, the municipal prosecutor shall transmit defendant's discovery requests to the prosecutor, or, if there is no prosecutor, the municipal prosecutor shall transmit defendant's court ordered discovery requests to the complaining witness.
(b) Discovery by Defendant. In all cases involving a consequence of magnitude or when ordered by the court, the defendant, on written notice to the municipal prosecutor or private prosecutor, shall be allowed to inspect, copy, and photograph or to be provided with copies of any relevant:
(1) books, tangible objects, papers or documents obtained from or belonging to the defendant;
(2) records of statements or confessions, signed or unsigned, by the defendant or copies thereof, and a summary of any admissions or declarations against penal interest made by the defendant that are known to the prosecution but not recorded;
(3) grand jury proceedings recorded pursuant to R. 3:6-6;
(4) results or reports of physical or mental examinations and of scientific tests or experiments made in connection with the matter or copies of these results or reports, that are within the possession, custody or control of the prosecuting attorney;
(5) reports or records of defendant's prior convictions;
(6) books, originals or copies of papers and documents, or tangible objects, buildings or places that are within the possession, custody or control of the government;
(7) names and addresses of any persons whom the prosecuting attorney knows to have relevant evidence or information, including a designation by the prosecuting attorney as to which of those persons the prosecuting attorney may call as witnesses;
(8) record of statements, signed or unsigned, by the persons described by subsection (7) of this rule or by co-defendants within the possession, custody or control of the prosecuting attorney, and any relevant record of prior conviction of those persons;
(9) police reports that are within the possession, custody or control of the prosecuting attorney;
(10) warrants, that have been completely executed, and any papers accompanying them, as described by R. 7:5-1(a);
(11) the names and addresses of each person whom the prosecuting attorney expects to call to trial as an expert witness, the expert's qualifications, the subject matter on which the expert is expected to testify, a copy of the report, if any, of the expert witness, or if no report was prepared, a statement of the facts and opinions to which the expert is expected to testify and a summary of the grounds for each opinion. If this information is requested and not furnished, the expert witness may, upon application by the defendant, be barred from testifying at trial.
(c) Discovery by the State. In all cases involving a consequence of magnitude or when ordered by the court, the municipal prosecutor or private prosecutor, on written notice to the defendant, shall be allowed to inspect, copy, and photograph or to be provided with copies of any relevant:
(1) results or reports of physical or mental examinations and of scientific tests or experiments made in connection with the matter or copies of these results or reports within the possession, custody or control of the defendant or defense counsel;
(2) any relevant books, originals or copies of papers and other documents or tangible objects, buildings or places within the possession, custody or control of the defendant or defense counsel;
(3) the names and addresses of those persons known to defendant who may be called as witnesses at trial and their written statements, if any, including memoranda reporting or summarizing their oral statements;
(4) written statements, if any, including any memoranda reporting or summarizing the oral statements, made by any witnesses whom the government may call as a witness at trial; and
(5) the names and addresses of each person whom the defense expects to call to trial as an expert witness, the expert's qualifications, the subject matter on which the expert is expected to testify, and a copy of the report, if any, of such expert witness, or if no report is prepared, a statement of the facts and opinions to which the expert is expected to testify and a summary of the grounds for each opinion. If this information is requested and not furnished, the expert may, upon application by the prosecuting attorney, be barred from testifying at trial.
(d) Documents Not Subject to Discovery. This rule does not require discovery of a party's work product, consisting of internal reports, memoranda or documents made by that party or by that party's attorney or agents, in connection with the investigation, prosecution or defense of the matter. Nor does it require discovery by the government of records or statements, signed or unsigned, by defendant made to defendant's attorney or agents.
(e) Protective Orders.
(1) Grounds. Upon motion and for good cause shown, the court may at any time order that the discovery or inspection, copying or photographing sought pursuant to this rule be denied, restricted, or deferred or make such other order as is appropriate. In determining the motion, the court may consider the following: protection of witnesses and others from physical harm, threats of harm, bribes, economic reprisals and other intimidation; maintenance of such secrecy regarding informants as is required for effective investigation of criminal activity; protection of confidential relationships and privileges recognized by law; and any other relevant considerations.
(2) Procedures. The court may permit the showing of good cause to be made, in whole or in part, in the form of a written statement to be inspected by the court alone. If the court enters a protective order, the entire text of the statement shall be sealed and preserved in the court's records, to be made available only to the appellate court in the event of an appeal.
(f) Time and Procedure. A defense request for discovery shall be made contemporaneously with the entry of appearance by the defendant's attorney, who shall submit a copy of the appearance directly to the municipal prosecutor. If the defendant is pro se, any requests for discovery shall be made in writing and submitted by the defendant directly to the municipal prosecutor. The municipal prosecutor shall respond to the discovery request in accordance with paragraph (b) of this rule within 10 days after receiving the request. Unless otherwise ordered by the judge, the defendant shall provide the government with discovery, as provided by paragraph (c) of this rule within 20 days of the prosecuting attorney's compliance with the defendant's discovery request.
(g) Continuing Duty to Disclose; Failure to Comply. If a party who has complied with this rule discovers, either before or during trial, additional material or names of witnesses previously requested or ordered subject to discovery or inspection, that party shall promptly notify the other party or that party's attorney of the existence of these additional materials and witnesses. If at any time during the course of the proceedings it is brought to the attention of the court that a party has failed to comply with this rule or with an order issued pursuant to this rule, the court may order that party to permit the discovery, inspection, copying or photographing of materials not previously disclosed, grant a continuance, prohibit the party from introducing in evidence the material not disclosed or enter such other order as it deems appropriate.