Los Angeles ( CNN ) -- The security video system in Justin Bieber 's mansion could be the best witness to the teen pop star 's alleged egg attack on a neighbor . `` It was extensive , '' Los Angeles County Sheriff 's Lt. David Thompson said of the system . `` I believe it was installed very well and covered all areas of Mr. Bieber 's house . His security system was well operated . '' A dozen deputies , armed with a search warrant from a judge , seized the hard drives that hold the security video from last week . Detectives are scouring the video frame-by-frame for clues as to who tossed eggs from Bieber 's property onto the house next door in the exclusive Calabasas , California , community last Thursday night , Thompson said . `` It will either prove or disprove , or maybe neither . '' If video from that night is missing , detectives will call for help , he said . `` We have a high-tech crew that works on such things , depending on what we find they can tell if it 's been deleted , altered or stopped at a certain time or turned off , '' Thompson said . `` If it 's 24-hour security video and it does n't show a particular day , you can make your own conclusions . '' While the neighbor who accused Bieber of launching the egg assault does not have a similar video system , TMZ did obtain video of the incident recorded by the accuser . While the attackers ca n't be seen , they are heard . Detectives could use test that audio to determine whether there 's a match to Bieber 's voice . Bieber and his representatives have stayed silent about the incident , declining to comment when contacted by CNN . Although the singer spoke to deputies during their search -- telling them who was in the house , for example -- he has not talked to investigators about the felony vandalism allegations , Thompson said . His lawyer would need to be present for that to happen , he said . Justin Bieber 's bad year : A guide . Bieber 's wake up call . Bieber was asleep when investigators knocked on his door Wednesday morning , Thompson said . The security staff answered and let them in . The warrant allowed deputies to go room by room through the sprawling estate , which is how they busted Lil Za -- real name Xavier Smith -- who was a house guest . They found suspected Ecstasy -- aka Molly -- and Xanax near the 20-year-old rapper 's bed , Thompson said . Lil Za was arrested on a felony drug charge . He was later charged with felony vandalism for allegedly busting a jail phone while waiting to be bailed out . Despite all the egg jokes dished out , this is a serious case , Thompson said . The neighbor 's house suffered an estimated $ 20,000 in damage , which makes the alleged vandalism a felony . It could land the offender in jail , but at the every least a long probation term and community service . Add to that the legal bills and time attending court hearings . Deputies at the Lost Hills Sheriff 's Station , which serves an affluent section of Los Angeles County just east of Malibu , have become familiar with Bieber , 19 , since he moved into a $ 6.4 million home in The Oaks neighborhood two years ago . Neighbors have dialed 911 several times to complain that the teenage multimillionaire was speeding down their residential streets in his high-performance cars . One neighbor accused Bieber of spitting in his face during a heated confrontation last March . Deputies have responded to complaints about loud parties at Bieber 's place . Except for warnings , nothing was done . The Los Angeles County District Attorney 's office concluded that they could n't prove the spitting or speeding cases in court , so they declined to prosecute . Prosecutors also rejected a misdemeanor battery complaint from a photographer who accused Bieber of attacking him in the parking lot of a Calabasas shopping center as he was taking photos of Bieber and his then-girlfriend , Selena Gomez , in May 2012 . `` We did n't do this search warrant to send a message , '' Thompson said Tuesday . `` That 's not what we do , but we hope maybe that understanding the gravity of this will change some of the behavior . '' If detectives find evidence that Justin Bieber attacked his neighbor with eggs , they will present their findings to the district attorney for possible prosecution . This could happen in a few days or weeks , Thompson said . Until then , Bieber is free to roam the world , he said . `` I do n't feel that he 'll flee in any way . '' Bieber 's Brazil adventures : Truth or idol gossip ?
Security cameras `` covered all areas of Mr. Bieber 's house , '' investigator says . A `` high-tech crew '' could help detectives if security video was erased . Detectives will take any evidence of Bieber 's involvement in egging to the DA . Maybe the egg probe will change Bieber 's behavior , detective says .