A paedophile found with a syringe and a bottle of chloroform claimed he used them to experiment on animals, Cardiff Crown Court has been told.
The judge said John "deliberately flouted" the order
Christian John, 28, told police officers he used the items for carrying out experiments on small animals.
John, who admitted breaching a sex offender's order, has previous convictions including indecent assault on a male under 16.
Judge David Wynn Morgan jailed John for two-and-a-half years.
Other items he had in a rucksack when he was arrested last October included a 10-inch knife and a camera.
But the 28-year-old was banned from carrying a camera under the terms of a sex offender's order imposed on him in a bid to protect the public, the court was told.
Owen Williams, prosecuting, said an officer, who found John apparently drunk in a street in Dinas Powys in the Vale of Glamorgan, searched him and found the 10-inch kitchen knife in a pocket.
John, from Cardiff, told officers in interview that he had forgotten he was not allowed to
carry any photographic equipment, said Mr Williams.
"He said he did not want to answer questions about the chloroform, but then
said he sometimes conducted experiments on animals using chloroform," said Mr
"He again said he used the syringe to carry out experiments by injecting
chloroform into small rodents and squirrels."
John was made subject to the sex offender's order last May.
The condition banning John from carrying a camera was included because he had
taken photographs of children at a playground and it was alleged he had been
found with pictures of youngsters aged five to 12, the court was told.
Jeremy Jenkins, defending, said: "It is all too easy to
jump to conclusions."
He said the photographs developed from the two cameras had proved to be
innocent pictures, showing John with his father and other family members at a
pub and at The Gnoll, Neath's rugby ground.
The other items John was carrying "raised the eyebrow of suspicion," said Mr
Jenkins, but he added: "He is a person who, having been subject of an order,
breaches it in a rather innocuous way by having a camera used for legitimate
Judge David Wynn Morgan said: "You are a
predatory paedophile presenting a significant danger to pre-pubescent males.
"Each of the terms of the order were carefully drafted and considered
necessary for the protection of the public.
"You have asserted you simply forgot you were not supposed to have a camera
with you. This court does not believe you."