Poisoning food with feces is detailed as a tactic in the Al-Qaeda manual found a few years ago by British intelligence.
Also, there are precedents, both involving Muslims, as does this story:
A man who is accused of waging a urine and faeces-spraying campaign at two supermarkets, a pub and a bookshop caused Â£700,000 damage, a court heard yesterday.
Sahnoun Daifallah, 42, is alleged to have squirted a brown, foul-smelling substance from a spray container at four businesses in Gloucestershire on May 14 and 16 last year.
The court heard the man from White City, Gloucester, visited the Air Balloon pub at around 12.45pm on May 14 where police were called after he asked a barmaid Susan Lawson-Bagent how much it would cost to rape her.
When officers arrived Daifallah had gone but he had left a trail of stench behind him which the prosecution say was his calling card.
Stephen Dent, prosecuting, told the jury: “He mixed up an evil potion of various biological ingredients including his own faeces and urine.
“It was not until after he had left that staff started to notice a bad smell of excrement.
“We say that this was his little calling card because he did not like the way he had been treated.”
Daifallah then moved on to Waterstone’s bookstore in Cirencester where it is alleged he sprayed the brown substance all over a toilet in the coffee shop.
Staff noticed the smell but it was not until after he had left the store that they discovered a 20-metre area of 38 shelves had been doused in the foul substance.
In total 706 books were contaminated, most of them in the children’s section.
On May 16 at around 11am Daifallah is said to have visited the Tesco store in Quedgeley.
Mr Dent said a customer saw Daifallah reach into his laptop bag and produce a jet of fluid over the frozen chips.
He allegedly moved on to the wine section where a member of staff saw a fine vapour come from bag and on to the wine, leaving brown fluid over the shelves….