A closer look
Criminal investigators could theoretically abandon standard fingerprints entirely and successfully identify every single criminal suspect based exclusively on the incredibly unique microscopic bumps and biological grooves permanently mapped across their tongue; just like the highly specialized swirling ridges firmly planted on your fingertips, the specific geometric pattern of your lingual papillae is entirely unique to your specific biology and fundamentally never changes basic shape over the entire exhaustive course of your natural lifespan, while simultaneously being conveniently protected safely inside the damp oral cavity, naturally shielded from harsh environmental damage, and almost entirely impossible to artificially alter without enduring severe surgical intervention, so thankfully, modern law enforcement has not yet fully pivoted to aggressively dusting messy crime scenes for stray saliva or forcing suspected felons to dramatically press their wet tongues onto a police ink pad
