Answer:
if I were juror in murder case, the I would conduct all the scientific evidence, and if it still conflicts with ALL the witnesses I would not believe the witnesses. but I still would not announce my decision. I would want more evidences and proofs to announce my decision because I just can't rely only on scientific evidence, (what if the person who murdered changed the fingerprints and other scientific evidence, you never know)
Answer:
in marbury v. madison, the supreme court established a principle that would eventually be used by all courts to
Judicial review
, a jury is the trier of fact. The jury finds the facts and applies them to the relevant statute or law it is instructed by the judge to use in order to reach its verdict.