In reviewing a case that challenged a definition of reasonable doubt that one State used, the Supreme Court ruled that the use of "to a moral certainly" was deemed to be ambiguous, arbitrary and confusing. The Court’s ruling resulted in all states reviewing and, as necessary, revamping their definition of "proof beyond a reasonable doubt". The template that most, if not all, states used to create their new model for reasonable doubt was:
"The level of certainty a juror must have to find a defendant guilty of a crime. A real doubt, based upon reason and common sense after careful and impartial consideration of all the evidence, or lack of evidence, in a case. Proof beyond a reasonable doubt, therefore, is proof of such a convincing character that you would be willing to rely and act upon it without hesitation in the most important of your own affairs. However, it does not mean an absolute certainty."
While no state ended up with the above as their new model definition for reasonable doubt, some states did extract from it. But, basically, across our fifty states, there are now over forty different definitions of reasonable doubt.
Still, if you look at the above template definition, it comes across very clearly. So ask yourself this question: within the most important of your own affairs, what would constitute such a convincing character that you would be willing to act upon it without hesitation?
For example, would you drop your child off in a situation where you thought there was 1 in a 100 chance that they could suffer serious harm?
Without hesitation, I know that I would not drop off my dog if I thought there was one in a hundred chance (1% error rate) of him being injured or otherwise suffering harm. Moreover, I would not even drop off a goldfish.