SEX PSYCHO DOSED JAYCEE AND HER KIDS WITH ILLICIT NARCOTICS

Monster kidnapper Phillip Garrido kept Jaycee Dugard drugged to stop her from running away.

That's the shocking secret insiders believe Jaycee and her daughters have divulged to police behind closed doors, a source close to the investigation told The ENQUIRER.

Police searched Garrido's ramshackle home in Antioch, Calif., after his arrest - and found numerous prescription medicine bottles in the shed and tents where Jaycee and her daughters lived all those years, said the source.

Phil and his wife Nancy's names were printed on the labels, and the bottles were found strewn on makeshift dressers and shelves, some empty and some still full.

Authorities found Valium and other highly addictive tranquilizers - which sources say Garrido, 58, forced Jaycee to take during her captivity.

After interviewing Jaycee, 29, and her daughters, Starlit, 15, and Angel, 11, police believe the Garridos "forced Jaycee to take the powerful sedatives to keep control over her," revealed the source.

"The narcotics were used to keep them from escaping. Garrido allegedly turned Jaycee into a sex slave, often keeping her in a drug-addled state, and police are investigating whether he gave the drugs to her daughters, too."

In a shocking disclosure, an eyewitness says he saw the accused kidnapper and rapist force Jaycee to smoke marijuana.

"One night we were sitting around Phil's house when he lit a marijuana cigarette and shoved it into the hands of the young woman we knew as Allissa. He watched to make sure she inhaled. Phil said he wanted to make sure she did it right - but it was more than that.

"She was afraid, and he glared at her in anger. She tried to pass the joint back after a couple of hits, but Phil pushed her hand back and told her to keep inhaling."

Jaycee's daughters rarely went out in public, but when they did, witnesses say they appeared to be dazed, unemotional and in what some believe to be a drug-induced state.

A source who saw them at a birthday party shortly before they were rescued, reveals: "There was a blank look in their eyes, almost like they didn't know where they were."

Noted criminal profiler Pat Brown told The ENQUIRER that it is not unusual for rapists and kidnappers to use drugs to control their victims - and even win them over. Utah kidnap victim Elizabeth Smart recently revealed in court testimony that her captor forced her to use drugs and alcohol.

Said Brown: "It's how abductors start to work their victims toward feeling good about what's going on and not resisting."