I didn't know that PG had two prior parole violations. He was on federal parole so that agency was responsible at the time for searching his house and knowing his friends. It seems like since he was a violator they would have checked his residence for drugs, etc.
http://www.news10.net/news/local/story.aspx?storyid=66366
"SAN FRANCISCO (AP) -- Federal authorities say Phillip Garrido
violated parole twice and was briefly jailed in 1993 while he allegedly was holding Jaycee Dugard captive.
Cranston Mitchell, vice chairman of the U.S. Parole Commission, declined to discuss details, citing confidentiality issues, but characterized the violations as minor offenses.
He said Garrido was briefly jailed until it was decided he could return home on parole. According to the Bureau of Prisons, Garrido was in federal custody from April 4, 1993 until May 10, 1993.
Garrido was then confined to his home until Aug. 31, 1993."