UCPR r 5.2 is constitutionally valid and may be used to compel disclosure of confidential journalistic sources even where the sources provided information on government or political matters. The rule satisfies the second limb of the Lange test because it facilitates the legitimate end of enabling defamation proceedings against unidentified persons, the source has the defence of qualified privilege available, and the rule's threshold preconditions and judicial discretion ensure compatibility with the implied freedom. Applicants for preliminary discovery must disclose the substance of inquiries made and their results to enable the court to make an objective assessment of reasonableness.
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