Evidence to Convict?

[downbeatplumb]

Eyewitness testimony not good enough?

I wouldn't consider a vague claim, as witness testimony.  Witness testimony is about sharing what was seen, heard, or otherwise experienced (smells, touch... etc)  The judgement of that information is still up to the one who it is transmitted to. He didn't give any information, other than he thinks I'm a liar. The basis for that conclusion is yet un-evidenced. 

Of course, I was assuming that it was something in recent context and immediately pertinent as well.

I would consider witness testimony a "vague claim" right until it is supported by evidence. especially when the testimony is about things that go against the usual way nature works.
My wife may say "I saw your friend down town today" and I may think this is likely as my friend has been known to visit the town BUT my wife has mistaken a man in a similar jacket for me so is not the most reliable witness. I would have to ask my friend if he was in town at the same time to verify it.

Witness testimony is not evidence on its own.