The first UK research study into the medical benefits of cannabis on Multiple Scelrosis has shown there is no benefit.
However there were benefits for those at the lower end of the disability scale.
The CUPID (Cannabinoid Use in Progressive Inflammatory brain Disease) study was carried out by researchers from the Peninsula College of Medicine and Dentistry.
It enrolled nearly 500 people with MS from 27 centres around the UK, who were either given capsules containing the active ingredient of cannabis and some given a placebo.
Alison Smith, an MS sufferer took part in the trial:
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Scotland Yard said the male youths will appear in custody at Westminster Magistrates' Court on Saturday.
Windy this weekend with gales across northwestern parts of the UK. Rain spreading southeast.
Greater Manchester Police said "inquiries are ongoing to fully understand the circumstances of the incident."