A MAN who smoked cannabis to relieve his chronic back pain was stopped by police as he drove home from retrieving his mum's prescription medication.

Blackburn magistrates heard police had been alerted to the possibility of a man driving under the influence of drugs and stopped Scott Crump close to home.

Crump, 42, of School Street, Great Harwood, pleaded guilty to driving with the proportion of cannabis in his blood over the prescribed limit.

He was fined £120 with £50 costs and £30 victim surcharge and banned from driving for 12 months. The court heard Crump gave a reading of 8.4 against the legal limit of two.

Damian Pickup, defending, said on the night he was stopped Crump had been contacted by his mum who has her own health problems.

he had left her medication at a friend's house in Blackburn when she visited earlier in the day.

"He was on the way back to drop the medication off when he was stopped," said Mr Pickup.