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Tests on the bodies of two young men who were found dead in a pond in Canterbury show they both had alcohol and a legal high in their systems at the time of their deaths.
Police say the substance called Methoxetamine has similar effects to the banned Class C drug Ketamine.
17 year old Hugo Wenn and Daniel Lloyd who was 25 were discovered almost 10 hours apart in Reed Pond, near Howe Barracks on January 30th.
Post-mortem examinations carried out on the men revealed that they both died from drowning and police say they are not treating the deaths as suspicious.
Detectives investigating the case have said they are not treating the men's deaths as suspicious.
In statements issued through Kent Police, relatives of both young men - whose deaths have triggered outpourings of grief in their communities - said they would be deeply missed.
The family of 6ft 3in "gentle giant'' Hugo, from Barham, said: "Hugo was a lovely boy who lived life to the full. He enjoyed every waking moment and enriched all those whose lives he touched.
"We feel privileged to have known him, albeit far too fleetingly. He will be sadly missed by many and will never be forgotten. May you rest in peace, our darling Hugo.''
Mr Lloyd's family, from Wincheap, Canterbury, said: "We are obviously devastated by Daniel's death. He was a much-loved son, brother, father, grandson, nephew and cousin.
"Daniel was a larger-than-life character who will leave a massive hole in our lives. His talent helped to reveal a unique and beautiful soul and we will miss him dearly.''