T in the Park bosses are under pressure after pathologists confirmed all three deaths at this year's music festival were drug related. 

Drugs have been blamed for the death of 29-year-old festival goer Jim Robertson whose body was found near an area of the A9, near Forteviot, Perthsire two days after the event. 

A verdict of 'presumed drugs related' has been recorded for 17-year-old Megan Bell and 17-year-old Peter MacCallum who both died in a temporary hospital at the Strathallan Castle site before the festival had started. 

Local MSP Murdo Fraser said: “Festival organisers must take responsibility for public safety and that includes discouraging the use of narcotics. An approach where drug use is seen as part and parcel of the festival cannot be allowed to continue.”

He added: “Lessons must be learnt and I would hope that a different approach is taken in advance of next year’s festival.”

Police have launched an investigation into the circumstances of Mr Robertson's death.

The Dundee Courier revealed that pathologists have confirmed all three deaths were drug-related. 

Jim Richardson was previously part of a missing persons investigation after he failed to return to his family home when the festival ended. 

He was last seen getting off a bus returning from the T in The Park at Auchterarder at around 2.30pm.

His body was later discovered on July 12. 

Police Scotland are also investigation the circumstances surrounding the deaths of two teenagers who died before the festival started. 

Peter MacCallum, 17, from Argyll, died in the early hours of Friday morning, July 8, at the popular Scottish music festival T in the Park. 

Megan Bell, 17, from County Durham, died in the early hours of July 8 after collapsing in the festival's Slam dance tent. 

Theres deaths are said to be unconnected. 

Now, Chris Bell, 44,  the father of 17-year-old Megan Bell, has called for a full investigation into his daughter's death. 

He has demanded a full inquiry into the circumstances surrounding her death and set up an online petition to increase the age restrictions of festival goers to 21. 

Mr Bell said drugs were not a part of his daughter's life and believes she may have been spiked, after Megan told her father how easily accessible they were at a previous festival. 

He said: "It is unexplained. We know she was at a festival. We know that she didn’t take drugs, it wasn't a part of Megan's life.

"But she was there...she may have experimented or she could have been spiked.

"This is devastating. We will never come to terms with it."

A spokeswoman from DF Concerts said: "We are devastated by the death of Megan Bell however, we believe the family should be allowed to grieve in peace."