The detective left fighting for life by the novichok attack in Salisbury is suing his force.
Det Sgt Nick Bailey was medically retired after he was contaminated with the nerve agent at the home of Sergei and Yulia Skripal.
Lawyers acting for the former officer lodged the case against the Chief Constable of Wiltshire Police Kier Pritchard at the High Court earlier this month.
The personal injury claim, filed under “accidents at work”, comes after Mr Bailey’s wife Sarah tweeted last December that he was still “fighting for part of his pension” after the March 2018 attack.
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Mr Bailey returned to duty but left last October saying the aftermath “took so much from me”.
He came into contact with the nerve agent, which had been smeared on the front door handle, when he searched the home of former Russian spy Sergei.
Mr Bailey spent 17 days in hospital.
His lawyer, Patrick Maguire, said: “Our client experienced a trauma which had a devastating effect on his family and forced him to leave the job he loved.”
The family of Dawn Sturgess is suing the Russian state over her death.
She and partner Charlie Rowley were poisoned after he found a fake perfume bottle containing novichok.
Two members of the Russian security services are suspected of carrying out the attack.
Wiltshire Police said it would be “inappropriate” to comment.
Russian spies in ‘heinous act’
The son of a man killed by the suspected Salisbury poisoners has called his death a “heinous act”.
Russian spies Alexander Mishkin and Anatoliy Chepiga, accused by Britain of the Skripals’ assassination attempt, are blamed for murdering two men in a blast at a Czech Republic arms dump.
Ondrej Havranek, the son of one victim, said Russian involvement came as “an absolute shock”.
