Epidermal scan
An epidermal scan was a scan that could detect trace amounts of chemicals on a person's skin and clothing.

In 2373, during a shared telepathic experience between Odo, Benjamin Sisko, Jadzia Dax, and Garak, Thrax claimed epidermal scans found traces of tri-nitrogen chloride on their skin and clothing, supposed evidence of their complicity in detonating a plasma grenade on Terok Nor. Odo explained that it was also a cleaning solution being used in Quark's. ()
Scans