In Commonwealth v. Williams, after he was convicted of murder, the defendant asserted that the trial court committed a host of evidentiary errors. The Court held: 1. It was proper for the trial court to admit the deceased victim’s text messages into evidence under the party-opponent exception to the rule against hearsay; 2. The Commonwealth properly authenticated a photograph; 3. The trial court did not err when it limited the scope of the defense experts’ trial testimony because their expert reports did not indicate specific, necessary facts upon which the experts relied in rendering their opinions; 4. The rules of evidence permitted a police officer, based upon his personal perceptions, to offer an opinion as to how blood droplets were transferred to the site of their discovery.