"This, in practice, means do not pick up containers, syringes, needles, cosmetics or similar objects, made of materials such as metal, plastic or glass", she said.
Rowley and his partner Dawn Sturgess became ill on June 30 after handling a small bottle of Novichok near Rowley's home in Amesbury, reportedly disguised as a perfume bottle.
Police are continuing their search of Salisbury's Queen Elizabeth Gardens, where they believe Mr Rowley and Ms Burgess found the bottle containing the Novichok.
Senior coroner David Ridley headed a brief hearing Thursday, but said the cause of Dawn Sturgess' death won't be given until further tests are completed.
The investigation believes that potential assassins used a perfume bottle with Novichok to spray the nerve agent on the doorknob of Skripal's house in March. Britain was quick to condemn Russian Federation for the attack, as Novichok is a substance manufactured only there, but Moscow has denied playing any role in the matter and demanded proof. The Kremlin denied involvement and the incident sparked mass tit-for-tat diplomatic expulsions as relations between the countries soured.
"Charlie Rowley, 45, who was also exposed to the substance, remains in a critical condition in hospital, police said".
Specialists in hazmat suits looking for in public toilets Salisbury, traces of nerve agents are a novice.
Wiltshire Police said it would "continue to coordinate activity at a local level to ensure that Mr Rowley continues to receive the support he needs in his ongoing recovery".
"I can't say anything else about it but I hope the police are able to identify him for her sake".
Scotland Yard did not comment on this information.
Sergei Skripal was a double agent during the 1990s and early 2000s but was arrested in Russian Federation in 2006.
"They (the investigators) are sure they (the suspects) are Russian", the report quoted the source as saying.
Sturgess's family paid tribute to the mother of three, calling her "a gentle soul who was generous to a fault".
The nursing director said "many people" had come to the hospital concerned about possible exposure to Novichok but that only the five victims already identified had been exposed to the lethal nerve agent. British police believe that the cases are linked.
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