A long handshake can spread your DNA to objects you didn’t touch
The finding might have implications for crime scene investigations, researchers say
![people shaking hands](https://i0.wp.com/www.sciencenews.org/wp-content/uploads/2019/02/022619_TS_touch-dna_feat.jpg?fit=860%2C460&ssl=1)
DNA DISPERSAL Shaking hands or touching objects leaves some of your DNA behind. Other people may unwittingly spread your left-behind DNA to something they touch, even if you never laid a finger on the object, two studies suggest.
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