[Shakes]

I had a criminal law/procedure professor in law school (just a few years ago) who described the criminal standard of "beyond a reasonable doubt" like this:

"By a preponderance of the evidence" (the civil standard) means more than 50% certain.

"By clear and convincing evidence" (less often the civil standard) means something like 75% or greater certainty.

"Beyond a reasonable doubt" means at least 90% certain of guilt in order to convict.

This came from a criminal professor who seemed very much pro-defendant at times. I see no reason to divert from this assessment. However, I do think that juries often use a significantly lower standard of proof in criminal cases.