In Alvarado v. State, 912 S.W.2d 199, 213 (Tex.Crim.App. 1995), the court of criminal appeals found that the chain of custody of a bloodstained dollar bill found near the victim's body was sufficiently established by the testimony of the police officer at trial that the bill offered into evidence had the same serial number as the bill he found at the crime scene under rule 901(b)(1), Texas Rules of Evidence. Id. Rule 901(b)(1) states that the requirement of authentication or identification may be established by: "(1) Testimony of witness with knowledge. Testimony that a matter is what it is claimed to be." The court of criminal appeals found the dollar bill admissible "absent any showing by appellant of tampering or alteration." Alvarado, 912 S.W.2d at 213.