A judge warned about the side effects of smoking cannabis as he sentenced a user to life behind bars for killing his parents.
Kamil Dantes, aged 29, killed his disabled dad Leszek Dantes and mum Malgorzata at their family home in Worksop in what the judge called a ‘frenzied’ attack.
The pair, both aged 54, were found dead in their bedroom on April 21 last year.
Mr Dantes had more than 20 stab wounds and his wife between 25 and 30.
The attack was so severe the tip of one of the knives became lodged in Mrs Dantes’s head.
Kamil Dantes, originally from Poland, admitted manslaughter on the grounds of diminished responsibility and was handed a life sentence.
Sentencing him to a minimum term of just under 18 years, Mr Justice Haddon-Cave said he attacked his parents in a ‘brutal and unprovoked manner’ and had an ‘abnormality of mental functioning’.
He added: “Your deteriorating mental health had much to do with your history of drug use and in particular your cannabis habit.
“This is another example of the danger of cannabis use and its ability to induce psychotic behaviour.
“In this instance the result was particularly tragic.”
The court heard Dantes was a regular user of cannabis and had smoked the drug for 12 years.
Dantes said the attack was ‘the biggest mistake of my life’ and blamed it on his ‘damaged nervous system’.
He and his family, from Poland, arrived in the UK in 2006 and he worked in a sandwich factory.
The court heard Dantes was sectioned in 2011 after he told police that his parents had been murdered and replaced by imposters wearing their faces.
He was later released back into the community.
He was ordered to serve his sentence in a high security hospital.