Authorities carried out extensive forensic tests on Saturday looking for the source of a nerve agent that made two people suspected of handling a contaminated object from the March attack on a former Russian spy and his daughter.
a precautionary test in a hospital to verify possible contamination related to the case, but Wiltshire police said Saturday night that he had been acquitted.
The man and woman poisoned a week ago are in critical condition at the Salisbury District Hospital, which is also where Sergei and Yulia Skripal spent months being treated after they were poisoned.
Authorities have said that the four became ill by Novichok, a nerve agent weapon developed by the Soviet Union during the Cold War.
Police think 44 years – old Dawn Sturgess and her partner, Charley Rowley, 45, had a secondary exposure to the chemical weapon used in the attack on the Skripals.
Police have said they are looking for a vial that Novichok may contain. It is a slow and laborious process since there is no easy way to use modern technology to identify the location of the rare nerve agent.
Officials have said the search could take weeks or months. It has brought more than 100 officers to Salisbury and the nearby town of Amesbury, as suspicious sites are spared to protect the public from possible contamination.
The police gave all the appropriate specialist tests, said Salisbury Hospital. .
The hospital did not say whether the unidentified official could have been exposed to Novichok. But a statement said the officer initially sought medical advice at another hospital "in connection with the ongoing incident in Amesbury," which is where the latest victims developed symptoms of Novichok poisoning.
Salisbury Hospital added that "it has seen a number of members of the public who have come to the hospital with health problems since this incident began and none have required any treatment."
"We would like to reiterate the advice of Public Health England that the risk to the general public is still low," the hospital said.