BBC:
Traces of E.coli bacteria and the Aspergillus fungus were found by analysts who examined 90 samples bought in and around the Spanish capital.
The samples of hashish were wrapped up in plastic "acorns" were the worst offenders, reportedly because of the way they are smuggled into the country.
Some 40% of these also had the aroma of faeces, the study's lead author said.
Apparently there’s a two-in-five chance of buying literally shitty weed on the streets of Spain.