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By August 2019, having been in the Army for less than a year, Khalife was collecting £1,500 in a dog poo bag from a “dead drop” in Mill Hill Park, north London.

Between dead drops and TOR, this meant unlike traditional drug rings, no one actually has to meet face-to-face, shielding the operation from undercovers, turncoats and stool pigeons.

Inside US intelligence officials discovered a recording of a phone call Hanssen made to his handlers, as well as fingerprints left on trash bags used for dead drops.

An arrest team took Hanssen into custody after catching him making a "dead drop" of classified materials in a park in suburban Virginia, the FBI says.

State secrets can be illegally shared in countless different ways, from whispered conversations and dead drops to myriad social media platforms.