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Panyaev is reported to have tailed Navalny prior to his poisoning; the others are operatives of the FSB’s Criminalistics Institute, a secret laboratory which is reported to work with poisons.

Forensic science did not exist in 1787 — indeed, criminalistics would not be created for more than a century — but Madison had mastered the use of deductive logic through vigorous research practices through his careers as lawyer, diplomat and statesman.

Hatten is still employed by the Las Vegas police department, assigned to the criminalistics bureau, which includes crime scene investigations, the Review-Journal reported.

"Alexandrov was an operative of the Criminalistics Unit present in Tomsk where Navalny was poisoned," the entry on the sanctions list said.

It identifies the group as the FSB Criminalistics Institute, otherwise known as Research Institute - 2 or Military Unit 34435.