Yo, you think a detective sees fingerprints and bruises, but I’m sniffing out the invisible fingerprints of molecules. A tiny splash of a weird, industrial solvent that smells like old batteries, a trace of a metal alloy that only comes from a specific welding torch, or a faint residue of a homemade nitro compound that a crime scene crew would just toss aside. Those crumbs of chemistry tell a whole story—who was there, what they carried, maybe even the exact route they took. That's the kind of pivot that turns a bland case into a bombshell.