Most of the cannabis resin sold on the streets in one Spanish city contains fecal matter, researchers say.
A study published in the journal ScienceDirect found that 88 percent of the 90 hashish samples tested in Madrid, Spain, had fecal matter in them.
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Researchers believe the germs come from smugglers who swallow small baggies of the drug to avoid being detected.
It's now creating a public health issue.
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Researchers said that all of the samples were also contaminated by E. coli.
Unlike cigarettes, the joints don't have filters, meaning there is no protection from any contaminated particles.