Detective Sergeant Nick Bailey said poisonings in March 2018 "took so much from me" as he announced his departure from Wiltshire Police.
Charlie Rowley met with Alexander Yakovenko at the Russian embassy in London.
The site has been declared decontaminated after an almost year-long military clean-up operation.
On 4 March 2018, former Russian double agent Sergei Skripal and his daughter were poisoned with a novichok nerve agent in Salisbury. Two Russian nationals, Alexander Petrov and Ruslan Boshirov, were identified as suspects, but an arrest is yet to be made due to protection by Russian extradition laws. It has taken a year for Salisbury to be decontaminated of the poison.
The house is the last site in Salisbury to be decontaminated of the deadly nerve agent.
Almost a year after Sergei and Yulia Skripal were poisoned, people are still told not to pick up litter.
"It’s on my mind all the time. I’m dreading getting a cold."
A director at the council told HuffPost UK small businesses must be supported.
'This finding eliminates any remaining doubt.'
Detectives trained to memorise faces are trawling CCTV footage.