Evidence spoliation personal injury cases run into more often than most people expect. Store surveillance footage overwrites itself in days. A trucking company can reset its black box data. A vehicle sometimes gets sold for salvage before anyone photographs the damage. When evidence that would have mattered disappears, Arizona law gives courts a specific set of tools to address it. Those tools only apply if you can show why the loss should count against the other side.
What spoliation actually means
Spoliation is the loss, destruction, or alteration of evidence relevant to a legal claim. It can be intentional, like a business deleting footage after receiving a preservation letter. It can also be unintentional, like standard equipment settings automatically overwriting a recording before anyone thought to save it. Arizona law treats these two situations differently.
What Arizona actually requires for a remedy
Evidence spoliation personal injury cases turn on a specific legal test. In Smyser v. City of Peoria, the Arizona Court of Appeals set the bar for getting an adverse inference instruction. That instruction tells the jury it may assume the missing evidence would have hurt the party who lost it. To get it, you generally have to show two things. The evidence was essential to the case. Its unavailability resulted from an intentional act or bad faith, not simple negligence or an honest accident. A trial court has real discretion here. It isn’t required to give the instruction just because something went missing.
Electronic evidence has its own rule
Arizona Rule of Civil Procedure 37(g), amended in 2016, specifically addresses electronically stored information. Dashcam footage, texts, and telematics data all fall under this rule. A court can only instruct a jury to draw an adverse inference over lost electronic evidence if it finds the party intended to deprive the other side of that evidence. That’s a somewhat higher bar than the general spoliation standard for physical evidence.
The practical step that actually protects a claim
A spoliation letter, sent early and in writing, is the single most useful tool available before litigation even starts. It formally puts a business, driver, or facility on notice. Specific evidence, footage, records, or a damaged vehicle needs to be preserved for a legal claim. Once that notice exists, later destruction is much harder to characterize as an innocent accident. That strengthens any later request for an adverse inference instruction.
The bottom line
Losing key evidence isn’t automatically fatal to a claim, and it isn’t automatically a win for the other side either. Arizona courts look past the fact that something disappeared and focus on why. A business that ignored a preservation letter is in a very different position than one whose camera system simply recorded over old footage on its normal thirty-day cycle. What matters isn’t whether evidence exists. It’s whether you can show intent or bad faith behind its absence.
Frequently asked questions
It refers to the loss, destruction, or alteration of evidence relevant to a claim, whether that happens intentionally or through routine business practices like automatic camera overwrites.
Under Smyser v. City of Peoria, the requesting party generally must show the evidence was essential and that it went missing due to an intentional act or bad faith, not simple negligence.
Yes. Arizona Rule of Civil Procedure 37(g) requires a finding that a party intended to deprive the other side of electronically stored information before a court will give an adverse inference instruction over it.
Sending a written spoliation letter as early as possible, identifying exactly what needs to be preserved, so any later destruction is harder to explain as accidental.
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This article explains general Arizona rules about evidence preservation for informational purposes and is not legal advice. Whether missing evidence supports a legal remedy depends on the specific facts of a case.