There is an affirmative duty imposed upon defendants to preserve all relevant evidence in anticipation of litigation. See Williams v. Russ (2008) 167 Cal.App.4th 1215, 1223. In most cases, the day this duty arises the day of the injury causing event.
For other cases dealing with the altering or destruction of evidence see: Stephen Slesing, Inc. v. Walt Disney Co., (2007) 155 Cal.App.4th 736; Vallbona v. Springer, (1996) 43 Cal.App.4th 1525 and Karz v. Karl, (1982) 137 Cal.App.3d 637.
Of course there's not much you can do until a lawsuit has been filed, but if a defendant has tampered with, withheld or done the unthinkable and destroyed relevant evidence, then there are certain actions that can be taken against them. Also, you would have to be able to prove that the tapes have been tampered with. A mere allegation unsupported by proof will not justify any sanctions imposed by the Court.
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I agree with Mr. Blain. His analysis is accurate.
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Happens all the time, but luckily there is a "spoliation of evidence" inference.
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