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The parents of two 17-year-olds, Joe Lawton and Edward Thornber, who killed themselves after getting into trouble with police, were also at the court for the ruling.
Joe's parents, Nick and Jane Lawton, from Disley, Cheshire, say that their son would "still be here today" if he had received their support when he was taken into custody for drink driving.
Edward's mother Ann Thornber, from Manchester, also holding a photograph of her son, said:
A teenager has won a High Court victory over the Home Secretary's policy of treating 17-year-olds taken into custody as adults. The approach deprives the teenagers of protections offered to those aged 16 and under.
Two judges have ruled that that the policy is "incompatible" with human rights law.
Those under 16 are entitled to contact their parents or seek advice and assistance from an independent "appropriate" adult.
The ruling was a victory for Hughes Cousins-Chang, from Tulse Hill, south London, now aged 18, a sixth-form college student who was arrested by Metropolitan Police but subsequently found to be innocent.
He was detained for more than 12 hours and strip searched at a police station after being suspected of a robbery.