Why the inverted commas around "red mercury"? The BBC explains further:
Three men have been cleared of trying to procure a substance which police claimed could have made a "dirty bomb".
They were arrested in September 2004 after trying to buy "red mercury" from an undercover reporter.
Being accused of trying to buy red mercury sounds a little like being accused of trafficking Chris Morris's cake:
The most bizarre aspect of the trial of Abdurahman Kanyare and his two co-defendants was the fact that no-one in the court could be certain whether the terrifying substance on which the entire prosecution case was based actually existed.
The prosecutor, Mark Ellison, admitted the police had no idea if there even was such a thing as red mercury - supposedly the main ingredient for a "dirty bomb" which could have devastated London.
But he told the jury at the outset: "The Crown's position is that whether red mercury does or does not exist is irrelevant."
He warned the jury not to get "hung up" on whether red mercury actually existed at all.
David Amess, the Conservative Member of Parliament for Basildon, was fooled into filming an elaborate video warning against the dangers of a fictional Eastern European drug called Cake, and went as far as to ask a question about it in Parliament. The drug purportedly affected an area of the brain called "Shatner's Bassoon" and was frequently referred to as "a made-up drug". Other celebrities such as Sir Bernard Ingham, Noel Edmonds and Rolf Harris were shown holding the bright-yellow cake-sized pill as they talked.You can find Amess's question in Hansard.