Glastonbury Festival: Traces of drugs found in river at site

Are there "traces", or "environmentally damaging levels"? The language between the headline and body is inconsistent.

> The study found MDMA concentrations quadrupled the week after the festival

Compared to what?

And considering that cocaine is likely far more dangerous, would it not have made sense to give an idea how much more than normal is in the water?

... While we're on the topic of perspective, isn't it wild how little attention agricultural runoff gets? I'd guess it's an issue many orders of magnitude worse than Glastonbury's piss. I'd search for the issue on the BBC website to compare, but their dark patterns are a no-no.