A research team from the University of Surrey in the UK has reportedly developed a new, noninvasive drug test for cocaine that accurately detects its presence in your system through your fingerprints.

Specifically, it looks for two common cocaine metabolites: benzoylecgonine and methylecgonine. These can be found in blood, sweat, and urine using a mass spectrometry technique known as Desorption Electrospray Ionisation (DESI).

And since the metabolites dissipate from our sweat more quickly than in urine or blood (in which it can persist for up to a week), law enforcement will one day be able tell if a suspect is currently high as opposed to having been high a few nights before.

What’s more, “we can distinguish between cocaine having been touched,” Melanie Bailey, the study’s lead author, told Motherboard, “and cocaine having been ingested.”

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