The issue is that the specific record I am seeking—a 30-page report providing details about a specific suspect—has been accessed by a handful of private citizens, with its contents appearing on at least one public website.
Accessed how? Did the "handful of private citizens" in question submit records requests that were substantively identical to your requests? If yes, how do you know?
If the contents of the record are already publicly available, then what is the purpose of the request?
In other words, the agency is trying to pick and choose who gets access to the report.
When you pointed out to a representative of the agency from which you made the request that others had "accessed" the record in question and queried why your request was denied when their requests were (seemingly) approved, what response did you receive?
There is a case on point: Ardon v. City of Los Angeles, 62 Cal. 4th 1176, 1183 (2016).
How is it that you think this case is on-point? In
Ardon, the plaintiff (Ardon) had sued the City of Los Angeles and sought (via discovery request) certain documents. The City withheld the documents from production on the ground that the documents were protected by the attorney-client privilege and/or were work product. The trial court determined that the City's claim of privilege was correct. Years later, Ardon filed a public records request seeking to obtain documents relating to the case, and the City inadvertently produced some of the privileged documents. The issue before the California Supreme Court was whether the inadvertent production constituted a waiver of privilege that would allow Ardon to retain and use the records and distribute them to others. The Court held that the inadvertent production of the records did not constitute a waiver of the privilege. How is that "on point" with your issue? You included a page cite to page 1183 of the decision, but that page is simply a discussion of how the Court construes statutory language in the context of the statute's underlying purpose. The Court specifically noted that it was "doubtful the Legislature intended to enact a statutory scheme that would prevent government agencies from minimizing the damage caused by the inadvertent disclosure of private and confidential information. Nor is it likely the Legislature intended to adopt a rule that inadvertent disclosure requires confidential information to be made generally available to the public." I don't see how anything in the
Ardon case is relevant to your situation.
Any remedies besides filing suit?
If you can't convince the agency that you should receive the records, then no.