Anthony Kennedy

“ That said, the court conducting a harmless-error inquiry must appreciate the indelible impact a full confession may have on the trier of fact, as distinguished, for instance, from the impact of an isolated statement that incriminates the defendant only when connected with other evidence. If the jury believes that a defendant has admitted the crime, it doubtless will be tempted to rest its decision on that evidence alone, without careful consideration of the other evidence in the case. ”