A toxicology report showed that Tiger Woods had the active ingredient for marijuana, two painkillers and two sleep drugs in his system when he was arrested on a DUI charge.

Police released the report on Tuesday, less than a week after Woods agreed to enter a diversion program to settle his driving while intoxicated charges. It was first reported by ESPN.

The 41-year-old golf star was arrested in May when officers found him asleep in his car.

The 41-year-old was arrested when officers found him asleep in his carThe 41-year-old was arrested when officers found him asleep in his car (PA Picture desk)

In a statement on Tuesday, Woods said he was trying on his own to treat pain from back surgery he underwent in April. He said he realised that was a mistake and has undergone treatment.

Woods is scheduled to plead guilty to reckless driving on October 25 and enter the diversion program.

The report, prepared by the Palm Beach County Sheriff’s Office, says Woods had THC, the active ingredient for marijuana; as well as the painkillers Vicodin and Dilaudid; the anxiety and sleep drug Xanax; and the anti-insomnia drug Ambien in his system when he was arrested at 2 am on May 29 about 15 miles from his home in Jupiter.

Officers had found him in his Mercedes-Benz, which was parked awkwardly on the side of the road and had damage to the driver’s side. It was not clear how he damaged the car.

Woods said he had tried to self-medicate to relieve the back pain.

“I realise now it was a mistake to do this without medical assistance,” he said.

Tiger Woods admits his back is improvingTiger Woods admits his back is improving (Danny Lawson/PA)

“I am continuing to work with my doctors, and they feel I’ve made significant progress.”

Under a plea deal, prosecutors would drop the DUI charge, which is a more severe charge than reckless driving.

In the diversion program, Woods will spend a year on probation and pay a 250 dollar (£194) fine and court costs.

He would also have to attend DUI school, perform 50 hours of community service and attend a workshop where victims of impaired drivers detail how their lives were damaged. If Woods completes the program, he can ask a judge to expunge the reckless driving conviction.

His 79 PGA Tour victories and 14 major titles both rank No. 2 all-time. He has not competed since February because of his back injury and is not expected to return this year. His last win was in August 2013. Woods said his back is improving.

“I recently spoke to my surgeon and he’s very pleased with how my fusion is healing. I’m right on schedule. I’m now doing some light lifting, riding a stationary bike and putting a little,” he said.