Spoliation of evidence, once a suit is filed
The reason Bob requests the video from Alice Corp is not that he is concerned about his GDPR rights, it is because he wants to file a lawsuit. In fact, it would be super helpful if Bob had filed the lawsuit and served it together with the GDPR request, so there is a pending case... and added a paragraph that he demands the preservation of all evidence at that point.
In either case, the sudden deletion of the files by their DPO Charly, after Alice Corp was put on legal notice that they have to preserve evidence, is spoliation, indeed, it would be the very definition:
The intentional destruction or alteration of relevant evidence in existing or pending litigation. 1
The main remedy for spoliation is the imposition of a rebuttable presumption of fact that the lost or destroyed evidence would have been unfavourable to the party that destroyed it. This presumption can be rebutted by evidence showing that the “spoliator” did not intend to affect the litigation by destroying the evidence (McDougall v. Black & Decker Canada Inc., 2008 CarswellAlta 1686 (Alta. C.A.)).
So, we have the DPO performing spoliation, and thus the lawsuit for the beating will assume that the destroyed video showed exactly what Bob alleged that Alice Corp's security team did to him.
in england-and-wales DPO Charly can be further sued for destroying evidence under Section 2 (16) Criminal Justice Act 1987.
Spoliation might even happen before the case begins with filing & summons
According to an article by Chris Dale, discussion spoliation in england-and-wales the case of Earles v Barclays Bank Plc [2009] EWHC 2500 (Mercantile) (08 October 2009) was named as one of the best descriptions of spoliation in English law. That case indeed is illustrative, as it might be explicitly applicable to the case as described (emphasis mine):
28 [I]n this jurisdiction [Bermingham/England] as in Australia, there is no duty to preserve documents prior to the commencement of proceedings: British American Tobacco Australia Services Limited v. Cowell [2002] V.S.C.A. 197, a decision approved in this country by Morritt V.C. in Douglas v. Hello [2003] EWHC 55 at [86]. However, the leading text book in this area – Documentary Evidence by Charles Hollander QC- suggests in paragraph 10-06 of the 10th edition that "there might be cases where it was appropriate to draw adverse inferences from a party's conduct before the commencement of proceedings." In my judgment there would have to be some clear evidence of deliberate spoliation in anticipation of litigation before one could legitimately draw evidential "adverse inferences" in those circumstances. There is no such evidential basis in this case.
29 After the commencement of proceedings the situation is radically different. In Woods v. Martins Bank Ltd [1959] 1 Q.B. 55 at 60, Salmon J. said "It cannot be too clearly understood that solicitors owe a duty to the court, as officers of the court to make sure, as far as possible, that no relevant documents have been omitted from their client's list".
30 In the case of documents not preserved after the commencement of proceedings then the defaulting party risk "adverse inferences" being drawn for such "spoliation": Infabricks Ltd v. Jaytex Ltd [1985] FSR 75.
So, yes, we got it in a judgment from the High Court of Justice, Queens Bench Division, Birmingham District Registry, Mercantile Court: if it is extremely likely, that proceedings will begin shortly, destroying the video might be spoliation in anticipation of litigation, and thus be problematic even before proceedings started. As a remedy, an adverse inference might be drawn to the content of it.
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