Its importanat to clarify again the difference between Scientific evidence and anecdotal evidence.

Witness testimony is anecdotal evidence.

Scientific evidence is evidence that withstands the process of scientfic testing and analysis.

Because we lack Scientific evidence, it does not follow that Anecdotal evidence is wrong, but scientific/forensic evidence is generally more reliable than witness testimony. Where it hasn't been reliable, it has generally been because mistakes were made, the methodology was flawed, signiificant variables were not factored in, or because of deliberate bias ... take the Birmingham Six ...

I have had experiences that I could never hope to replicate and which I didn't understand. I know what I experienced, and I know my testimony is true. But I can't prove it so I keep it to myself.