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Almost 40,000 people have signed a petition calling on politicians to help a dad who faces criminal charges after giving his dying daughter cannabis oil.

Australian Adam Koessler was arrested and charged earlier this month after giving two-year-old Rumer Rose the oil to relieve her symptoms of late-stage cancer - something he claims led to a "miraculous" improvement in her condition.

But his bail conditions mean he cannot have contact with his sick daughter, who is now in intensive care after her condition deteriorated.

More than 38,000 people have now signed a petition calling for Queensland premier Campbell Newman and justice minister Jarrod Bleijie to intervene, saying "it is inhumane and unjust to keep a parent, who acted out of love for his child [and] wanting to prolong her life, away from her during such severe illness".

The petition adds: "Medical cannabis has been legalised in many countries and jurisdictions around the globe. There is ample evidence to show that it has many beneficial effects for cancer patients without the harmful side effects and other associated risks of current drug treatments. In fact working in conjunction with the recommended treatment regime, medical cannabis has also been proven to alleviate these adverse side effects.

(Image: Facebook)

"Adam Koessler deserves to have his parental rights to see his child reinstated, the charges against him dismissed by a court, and the right to decide the treatment options for his own child."

A further 30,000 people have supported a Facebook page highlighting Mr Koessler's plight, and thousands of dollars have been pledged to meet the cost of his legal fees and Rumer's treatment.

More than $14,000 have been raised to help Rumer's ongoing "Natural Cancer Protocol", which provides "organic, gluten free home cooked food, alkaline water, essential oils , energetic, chiropractic, [and] naturopathic healing" remedies for the toddler.

And a further $3,000 have been raised for Mr Koessler's legal expenses.

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Little Rumer has stage 4 neuroblastoma - a cancer which forms in the nerve tissue and has left her with just a 50% chance of survival.

But after giving her the cannabis oil mixed with coconut Mr Koessler, who is separated from Rumer's mum, says his daughter showed "miraculous" signs of improvement.

(Image: Facebook)

He told Australian newspaper the Newcastle Herald: “Her cancer-ridden little body was alive again – Rumer had almost instant quality of life.

“She would say ‘Daddy, tummy’s not sore’ and she would be able to eat like a champion and began to gain weight.

“Her energy was up and she wanted to go outside with me instead of lay on her back with her legs curled up.

“Her skin colour came back, her eyes were sparkling again and we just looked at each other in complete amazement.”

But after travelling to Brisbane for his daughter to have further treatment on January 2, Mr Koessler was arrested in hospital and has since been charged with supplying dangerous drugs to a person under 16 and possessing dangerous drugs.

He is due before the courts on Tuesday next week.