Potter Stewart,
Spencer v. Texas — Concurrence
“ Evidence of prior convictions has been forbidden because it jeopardizes the presumption of innocence of the crime currently charged. A jury might punish an accused for being guilty of a previous offense, or feel that incarceration is justified because the accused is a 'bad man,' without regard to his guilt of the crime currently charged. Of course it flouts human nature to suppose that a jury would not consider a defendant's previous trouble with the law in deciding whether he has committed the crime currently charged against him. ”
