| http://www.w3.org/ns/prov#value | - (b) If it appears from the evidence in the case or from other showing by a party that an informer may be able to give testimony necessary to a fair determination of the issue of guilt or innocence in a criminal case or of a material issue on the merits in a civil case to which the government is a party, and the government invokes the privilege, the judge shall give the government an opportunity to
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