There is no such system in the UK although "front of house" testing has been trialled at two festivals in 2016.
We went to the Swiss city of Bern to see a pop-up centre where clubbers get their drugs screened weekly.
And we followed a tablet from drop-off to testing and back to the user for results.
How the pill was tested
First we meet 26-year-old clubber "John" as he drops off a pill for testing.
He says he bought it from friends and he believes it is ecstasy.
