Looks like MO'M is getting desperate. If the defense really thought the voice calling for help was GZ, they'd fight tooth and nail to have it admitted.
I guess it was inevitable that someone made an appeal to pseudoscience in their search for truth. Before we have this discussion, I'm going to suggest some reading:
Frye v United States
The rule is that the opinions of experts or skilled witnesses are admissible in evidence in those cases in which the matter of inquiry is such that inexperienced persons are unlikely to prove capable of forming a correct judgment upon it, for the reason that the subject-matter so far partakes of a science, art, or trade as to require a previous habit or experience or study in it, in order to acquire a knowledge of it. When the question involved does not lie within the range of common experience or common knowledge, but requires special experience or special knowledge, then the opinions of witnesses skilled in that particular science, art, or trade to which the question relates are admissible in evidence.
Numerous cases are cited in support of this rule. Just when a scientific principle or discovery crosses the line between the experimental and demonstrable stages is difficult to define. Somewhere in this twilight zone the evidential force of the principle must be recognized, and while courts will go a long way in admitting expert testimony deduced from a well-recognized scientific principle or discovery, the thing from which the deduction is made must be sufficiently established to have gained general acceptance in the particular field in which it belongs.
Ramirez v Florida
According to Hart, a technician's ability to identify microscopic similarities in casts is developed by training and is passed on from one technician to another in the workplace.
A “match” under his method is declared if there is “sufficient similarity” in the striated marks on the casts to eliminate the possibility of coincidence. This determination is entirely subjective and is based on the technician's training and experience; there is no minimum number of matching striations or percentage of agreement or other objective criteria that are used in this method. No photographs are made of the casts, Hart explained, because lay persons and those not trained in this procedure would be unable to understand the comparison process; similarly, no notes are made describing the basis for identification. Once a match is declared under his theory, no other knives are examined because an identification under this method purportedly eliminates all other knives in the world as possible sources of the wound. Under Hart's method of identification, a team of expert technicians trained by him would be virtually impossible to challenge notwithstanding the fact that his procedure is untested and yet to be accepted by the relevant scientific community. There is no objective criteria that must be met, there are no photographs, no comparisons of methodology to review, and the final deduction is in the eyes of the beholder, i.e., the identification is a match because the witness says it is a match.
