Ultimately, usage prevails but meaning may be lost on the way.
"Forensic" used to be an adjective derived from forum and it meant connected with the courts or legal system. Hence, forensic science, a discipline that uses techniques like the analysis of DNA to obtain evidence for court purposes. "Forensics" seems to have become a synonym for forensic science. In the process, any other usage has at least diminished.
In an earlier age, before disclosure of evidence to the defence, a police sergeant from that earlier age told me a tale about the era when the Home Office forensic science lab for these parts was housed in a former suburban dwellinghouse in Harrogate. He'd been attending court at Leeds Town Hall and in the scrum before hearings started, he'd been renewing acquaintances with the forensic science service liaison officer. A few minutes later, he was approached by the defendant's worried-looking brief who asked if there was forensic evidence. On being told there was indeed forensic evidence, he dashed off and advised his client to plead guilty. ie All evidence at a trial is by definition forensic. If the learned friends who introduced this mumbo-jumbo to add to the mystery of their activities don't do etymology, we might do better sticking to plain English.