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Cannabis sold on the streets of Europe ‘contains FAECES’

Cannabis sold on the streets of Europe ‘contains FAECES because smugglers take laxatives to expel tiny pellets of the drug’

  • Samples of cannabis collected in Madrid were tested for bacteria
  • Three quarters were contaminated with E.coli which could cause illness
  • Most of the samples were too dangerous to be consumed, the scientists said 
  • It could pose a threat to people who use the drug to alleviate health problems 
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Cannabis being sold on the streets of Europe may be contaminated with faeces, scientists have discovered.

Samples sold in Madrid were tested and found E.coli bacteria in three quarters  – the diarrhoea and vomiting bug can be transmitted through human faeces.

Most of the samples were too dangerous to be consumed and pose a ‘public health risk’, the researchers said.

Though the study was only conducted in Spain, one expert told MailOnline the same ‘unusual’ thing could be happening in the UK and other places in Europe.

This is because of the way the drug is sometimes smuggled into countries – by swallowing it and later excreting it with the use of laxatives.

Experts said the findings are worrying considering some people who use cannabis do so to try and alleviate health problems. 

Tonnes of cannabis being sold on the streets of Europe may be contaminated with faeces, scientists in Madrid have discovered

The research team, led by José Manuel Moreno Pérez, a pharmacologist from the Universidad Complutense in Madrid, collected 90 samples in Madrid over a year.

The samples were separated into either ‘acorns’ or ‘ingots’, which are the shapes they are bought in.

Each sample was then broken down into smaller pieces and looked at under a microscope, the authors write in the journal Forensic Science International. 

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They found that 93 per cent of the acorn-shaped samples were contaminated with E.coli, as well as 29.4 per cent of the ingot samples.

Some 10 per cent of the cannabis samples were also contaminated with Aspergillus, a dangerous fungus that can cause serious health problems such as lung infections.

A total of 88.3 per cent of the cannabis samples were not suitable for consumption based on the amount of E.coli contamination allowed by guidelines in the EU and US.

The odour of each sample was also recorded and 40 per cent of acorns had an aroma of faeces, the researchers said. All of these were contaminated with E.coli.

The research team, led by José Manuel Moreno Pérez, a pharmacologist from the Universidad Complutense in Madrid, looked at 90 samples under a microscope. Pictured, an acorn shape

This led the researchers to suggest the way the cannabis is transported into the country – where it is illegal – may be to blame.

Mr Pérez told Spanish newspaper El País the cannabis is wrapped up in small plastic pellets and swallowed before the drug smugglers then ‘take a laxative and expel’ them in a toilet.


E.coli – full name Escherichia coli – is a bacteria commonly found in people’s bodies and which usually does not cause any illness.

However, it can cause infection in the gut or urinary tract infections (UTIs) which can have unpleasant symptoms.

Diarrhoea, abdominal pain and fever are all common effects, while more serious cases of the infection can cause bloody diarrhoea, dehydration or kidney failure.

Advice for avoiding E. coli infection includes good hand-washing, washing fruits and vegetables, cooking meat thoroughly and keeping raw meat separate from other food, and not swallowing water when swimming.

E. coli can cause hemolytic uremic syndrome (HUS), a rare disease of the blood which can lead to potentially deadly kidney failure. 

The acorns are then sold by dealers to unknowing users who, the authors pointed out, may believe contamination cannot cause harm if it is inhaled. 

Ian Hamilton, a lecturer in mental health and addiction at the University of York, told MailOnline the findings were ‘very unusual’ because this is the sort of thing you would associate with the smuggling of a drug like cocaine.

He said: ‘This highlights just how much you don’t know what you will be exposed to. The same thing could happen in the UK as has happened in Madrid.’

However, he said the contamination of E.coli could have been from the hands of the people who processed the drugs.

He added the results are particularly concerning for those with existing health conditions who use cannabis.

‘We know that some people who have problems with their health use cannabis to try and alleviate the problems they have. This group will be particularly vulnerable to this type of contamination which could make their underlying health problem much worse.

‘The risk of exposure to these type of bacteria is always there in an illegal market where some dealers and suppliers don’t have to adhere to any quality control.’

People with weakened immune systems or lung diseases, such as asthma or cystic fibrosis, are at a higher risk of developing health problems due to Aspergillus fungus.  

The findings, the authors said, are similar to that of a study which analysed samples of cannabis sold in coffee shops in the Netherlands, which also found that 80 per cent were contaminated with E.coli. 

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