From Adrian Bowyer, Foxham, Wiltshire, UK
You report that “monitoring wildlife… might be made easier and cheaper… [by] vacuuming bits of DNA out of the air” (31 July, p 16). Presumably, soon every CCTV camera will have an air sampler attached to detect our DNA. People walking past can expect to get everything from a text suggesting they visit a nearby shop to being arrested.
