Adefendant is on trial for murder. the only evidence linking the defendant to the crime is some blood found at the scene. the lead detective testifies that an officer took a vial containing a blood sample that had been retrieved by a crime scene technician and drove off with it. the officer is now dead. next, the prosecution presents as a witness a crime lab chemist. the chemist will testify that he took a vial of blood that contained a label identifying it as having been retrieved from the subject crime scene, and that he performed tests that established a match between that blood and a blood sample taken from the defendant. is the testimony of the chemist admissible? a yes, because there has been proper authentication. b yes, because the chemist qualifies as an expert witness. c no, because there is insufficient evidence of chain of custody. d no, because he did not take the original blood sample at the scene of the crime.