That's interesting. I don't believe I've been given that exact instruction when serving as a juror. The footnote in the link also notes the alternate wording "you must be firmly convinced of the defendant 's guilt..." can be used per the Ninth Circuit. I do remember being given that one.I will take a court’s jury instruction definition over yours every day of the week & twice on Sunday.
3.5 REASONABLE DOUBT—DEFINED
Proof beyond a reasonable doubt is proof that leaves you firmly convinced the defendant is guilty. It is not required that the government prove guilt beyond all possible doubt.
A reasonable doubt is a doubt based upon reason and common sense and is not based purely on speculation. It may arise from a careful and impartial consideration of all the evidence, or from lack of evidence.
3.5 Reasonable Doubt—Defined | Model Jury Instructions
www.ce9.uscourts.gov
Whenever people are told to use "common sense" to make a decision though, that seems to suggest subjective and experiential factors can and should be involved (as in opinions.) Common sense may lead to false conclusions as well. The Problem With Common Sense.
MOO