Fingerprint
From Tardis Wiki, the free Doctor Who reference
The Ninth Doctor claimed that an alien musical instrument would react to the smallest fingerprint. (TV: Dalek)
Fingerprints were used in forensics at some point after 1841. (AUDIO: The Mummy Speaks!) When Barbara Wright compared the use of psychometry in criminal investigations to the study of fingerprints on Earth, the Arbitan Tarron seemed unfamiliar with the concept. (TV: "Sentence of Death")
