If the source audio is not reviewable in court, none of it should be admissible as evidence. Algorithms are just laundering bad opinions like blood splatter analysis, so that there’s not even a personal reputation at stake.
You have way too much faith in the legal system. So many pseudo-scientific classes of evidence exist:
- Field sobriety tests
- Ballistic forensics
- Blood spatter analysis, as you mentioned
- Bite pattern analysis
- Burn / arson forensics
- Polygraph
- Biometrics under less-than-perfect conditions (your fingerprint reader on your phone works well because it's near perfect conditions. Crime scene partial finger prints are usually insufficient. Same for facial recognition -- works with your iPhone FaceID sensor, doesn't work with the gas station 480x320 camera)
- Most DNA and hair analysis
Pretty much all hocus pocus. Courts don't care. Anything for the conviction. Anyone hoping for fair scientific analysis in a court of law today is in for a rude awakening.