Stephen Zappala, Sr., Commonwealth v. Abu-Jamal (521 Pa…
“ Implicit in the fact that the statute assigns to the defendant the burden of proving mitigating circumstances by a preponderance of evidence is the understanding that the jury is to asses the evidence for credibility. It must be left open for the Commonwealth to challenge the veracity of facts asserted and the credibility of the person asserting those facts, whether that person is a witness or the defendant. ”
