A radiation scientist has spoken of his anger over the arrest on suspicion of the bomb.
Two police officers "felt uncomfortable" during a visit to Dr. Ing. Chris Busby in Bideford, Devon, where there was a lab.
The 73-year-old said he had been held under the Explosives Act for 19 hours before being released without further action.
The Devon and Cornwall police said their investigation was about public safety, not criminal matters.
The troop said she was summoned to the property to investigate concerns about the well-being of a woman.
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Dr. Busby, who previously advised the government on radiation risks, said neighbors reported that his 29-year-old roommate was acting "strangely".
A cordon was set up around his house on Wednesday morning when the two officials complained that they were uncomfortable – which Dr. Busby "attributed psychological problems related to her knowledge of script poisoning".
The scientist said he was handcuffed and interviewed by policemen all night, suspecting he was making a bomb, but the only substances found in his home were "harmless chemicals for radiation research."
He returned home that night and found out that the officers had searched his home lab and sealed off his house on Bridge Street.
"They destroyed my experiment, it was very irritating," he said.
Dr. Busby said he was targeted for his criticism of the government's recent assessment of radiation risks.
The troop said that the officers concerned were intact and that there was no risk to the general public.