The progress of the fire clearly indicates the detonation of CS, and therefore the injection of CS must be considered the primary cause of the fire, along with those who decided to inject it. I would have to have the original tape and try to do it myself. But from what I heard, I doubt that it is possible to extract what they presented in court from that tape. Nor would it be possible to reliably use such an enhanced version either as evidence or to identify the person speaking. At best it is an indication, which might be used to find other evidence, if it existed, but not as evidence in itself.
Similar considerations apply to computer enhancements of video or film footage.
You might be able to identify, say, a license plate number, which might point to which vehicle to further examine for evidence it was involved in a crime, but lacking such further evidence, the computer-enhanced image alone should not be used as evidence. Second, Danforth is also lying about the gunfire. He stated categorically that there was no credible evidence of gunfire by government agents, when he has the preliminary report of Carlos Ghigliotti and the earlier report by Allard, which are nothing if not credible. The fact that Ghigliotti is no longer alive to present his conclusions in personal testimony, and that Allard is unable or unwilling to do so because of his stroke, is not grounds to dismiss their work from consideration, and accept only the work of a contractor controlled by the government. However, the fates of Ghigliotti and Allard could explain why Danforth is lying.