"I don't know who's buried here, but I think there are bodies, " Dostie says as he praises his dog.

CNN: Behind the Scenes: Body hunt at Manson ranch

"Find Fred, " Dostie shouts, a command used to send Buster looking for remains.

CNN: Behind the Scenes: Body hunt at Manson ranch

Dostie shows us the bathroom where Manson was hiding at the time of his arrest -- crammed in a tiny cabinet.

CNN: Behind the Scenes: Body hunt at Manson ranch

"His hair was sticking out, " Dostie said, as he explained how Manson was found while an officer was using the bathroom.

CNN: Behind the Scenes: Body hunt at Manson ranch

After reviewing soil samples uncovered by Dostie, a team of Oak Ridge scientists recently traveled to the ranch for further testing.

CNN: Behind the Scenes: Body hunt at Manson ranch

They found enough evidence to excavate -- evidence of possible remains at three of the same places where his cadaver dog alerted, Dostie says.

CNN: Behind the Scenes: Body hunt at Manson ranch

Paul Dostie of the Mammoth Lakes, California, Police Department told CNN.

CNN: More tests at Manson ranch for buried bodies

One by one, with our camera rolling, the 4-year-old black lab goes to five separate areas, which Dostie believes are the site of old graves.

CNN: Behind the Scenes: Body hunt at Manson ranch