Spoliation of evidence occurs when a party destroys, alters, loses, or fails to preserve material relevant to litigation that is pending or reasonably foreseeable. The duty to preserve does not wait for a complaint to be filed -- it attaches the moment a party knows or reasonably should know that litigation is likely, whether that is a demand letter, an internal incident report, or a preservation notice from opposing counsel. Once that duty attaches, routine document-retention policies and auto-delete settings on email or messaging systems must be suspended for anything within scope.

Courts treat spoliation seriously because it strikes at the fact-finding process itself: a jury cannot weigh evidence that no longer exists. Remedies range from a relatively mild adverse-inference instruction telling the jury it may assume the missing evidence was unfavorable to the spoliating party, to monetary sanctions covering the cost of the lost discovery, to case-ending sanctions like dismissal or a default judgment in the most egregious, intentional cases.

Most jurisdictions require a showing that (1) the party had a duty to preserve the evidence at the time it was destroyed, (2) the evidence was destroyed or altered with a culpable state of mind, and (3) the destroyed evidence was relevant to the claims or defenses -- meaning a reasonable factfinder could conclude it would have supported the requesting party's case. The precise culpability threshold, ranging from mere negligence to bad faith, varies significantly by jurisdiction and by whether the evidence at issue is physical or electronic.

Federal Rule of Civil Procedure 37(e) carves out a specific, more forgiving standard for lost electronically stored information: if ESI that should have been preserved is lost because a party failed to take reasonable steps, a court may order measures no greater than necessary to cure the prejudice, but it may only give an adverse-inference instruction or impose case-dispositive sanctions if it finds the party acted with intent to deprive another party of the information's use. This intent requirement is notably higher than the negligence standard many states still apply to spoliation of tangible physical evidence outside the ESI context.

Parties proving spoliation rely on litigation-hold correspondence, metadata and forensic imaging showing when and how data was deleted or altered, and testimony about a company's document-retention practices. Defendants counter by showing the preservation duty never attached, that the loss occurred through the routine, good-faith operation of an electronic system before any hold issued, or that any gap caused no real prejudice. Because spoliation exposure turns on the timing of the preservation duty and the severity of available sanctions, Juricratic can model the evidentiary weight of a spoliation claim as a dial affecting the simulated strength of a party's case.