https://www.reagent-tests.uk/blog/tesla-ecstasy-pill-with-dangerous-amount-of-4-fa-inside/
Tesla pills have been around at least three years by now, honestly I'm surprised it's taken this long for there to be counterfeits.
EC haven't said which vendor or market they're from but I think it's time to start giving these the cold shoulder unless you test your shit.
Stupid thing is there is a massive hole in the market for 4FA in the UK where as a Tesla mdma pill is common place