Investigators are working to the theory that the substance was in a discarded perfume bottle found by Dawn Sturgess, 44, and her partner Charlie Rowley, 45 in a park or somewhere in Salisbury city centre, the source said.
"I am pleased to confirm that earlier today, Charlie Rowley was discharged from hospital".
She added that Mr Rowley had been decontaminated to ensure the nerve agent could no longer affect him or anyone who comes into contact with him.
More than 100 police officers had been searching for the source of Mr Rowley and Ms Sturgess' exposure in Amesbury, where they lived, and Salisbury, where the Skripals were poisoned in March.
Lorna Wilkinson, Salisbury District Hospital's director of nursing, said the day was "tinged with sadness" after the death of Ms Sturgess.
"I was so thankful when they told me he had regained consciousness and was getting better and to talk to him on the phone at the hospital was such a relief", Matthew said.
Detectives are investigating the possibility - described by Mr Rowley's brother - that Ms Sturgess tested the spray on her face and hands, believing it to be perfume.
Ex-Russian spy Sergei Skripal and his daughter Yulia collapsed in Salisbury on March 4 after being exposed to Novichok.
Mr Rowley told his brother Matthew that he and Miss Sturgess were contaminated after handling a container disguised as a perfume bottle Credit AFP
British police made a composite picture of the main suspect in the poisoning of former GRU officer Sergei Skripal and his daughter Yulia, RIA Novosti reports with reference to the Daily Mail.
Ms Sturgess died on July 8 and a murder inquiry has been launched.
They have since been discharged from hospital. Britain has blamed Russian Federation for poisoning the spy and his daughter, who both recovered after lengthy hospitalizations, as well as accidentally poisoning Rowley, Sturgess and a police officer who aided the Skripals.
Specialists in hazmat suits looking for in public toilets Salisbury, traces of nerve agents are a novice.
Sturgess initially collapsed at an address in Amesbury on June 30 and was taken to the hospital, police said. Moscow has repeatedly denied any involvement and accused the British intelligence agencies of staging the attack to stoke anti-Russian hysteria.
"Charlie Rowley, 45, who was also exposed to the substance, remains in a critical condition in hospital, police said".
Britain has blamed Russian President Vladimir Putin's government for the attack with a military-grade chemical weapon that was developed in the Soviet Union during the Cold War.
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