Testimonial evidence means spoken or written statements from witnesses under oath, used in 95% of criminal trials to establish what happened. The Sixth Amendment guarantees the accused ''the right to be confronted with the witnesses against him,'' requiring prosecutors to produce live witnesses for cross-examination, not just written statements. Police interrogations, victim accounts, expert opinions, and eyewitness identifications all count as testimonial evidence. Crawford v. Washington (2004) reshaped the rules: prosecutors cannot introduce a witness''s prior statement unless the defendant had a chance to question that witness. That blocked police from reading a suspect''s confession at trial without putting the suspect on the stand. The case overturned 24 years of precedent allowing ''reliable'' hearsay. Testimonial evidence carries weight but courts know it fails—DNA exonerations show eyewitnesses misidentified defendants in 69% of wrongful convictions. Juries trust confident witnesses, even when memory research shows confidence and accuracy don''t correlate. The Confrontation Clause forces prosecutors to test testimonial evidence through cross-examination, the legal system''s best tool for exposing lies, mistakes, and faulty memory.