Confirmation Bias: How to Mitigate its Impact on Litigation

Confirmation bias is the tendency for people to search for, interpret, favor and recall information that confirms their preexisting beliefs.  Conversely, information that supports a different viewpoint is likely to be dismissed or ignored.  Confirmation bias is a heuristic or mental shortcut which developed as a way for people to make sense and provide order in a complex world.  Rather than exerting cognitive effort needed for considering new or different information, people more easily construct their world using information that fits into their existing viewpoints.  Confirmation bias can be found in many facets of everyday behavior and can exert great influence in how people process information and make decisions in politics, finance, medicine, personal relationships, and our legal system.   For example, in politics, people often search for information that confirms and bolsters their political views (e.g., watching or reading articles that are consistent with their beliefs) and denigrate news sources that are contrary to their preexisting viewpoints.

How does confirmation bias affect litigation?

Confirmation bias exists in many aspects of our legal system.  In this article, we will examine ways it can impact litigation and the trial process, specifically with regard to how attorneys present evidence and how jurors perceive and process information.  We will also explore how the confirmation bias of attorneys potentially impacts the litigation process and the resolution of their cases.

The confirmation bias of the attorney

As advocates for their clients, attorneys spend a great deal of time reviewing the evidence and the law in order to present their case in the most favorable light.   Attorneys are continually advocating for their client during discovery, while writing briefs, arguing motions, participating in settlement negotiations, and throughout trial.  As attorneys work on a case, there is truth to the adage that there is a tendency to “fall in love with one’s case.”  Confirmation bias initially occurs when facts uncovered in discovery are interpreted in a way most favorable to their client and are given disproportionate importance while facts which are unfavorable are disregarded or given less significance and weight.  Confirmation bias can negatively impact litigation and the ultimate outcome of the case.  An attorney may disregard or dismiss important facts which do not confirm or easily fit with his or her theory of the case.  These disregarded facts, however, may be persuasive to a judge, mediator or jury.  An attorney also may give less weight to a seemingly irrelevant fact or an emotional argument, not objectively understanding how a jury may view this element of the case.  Attorneys and/or their clients may become enamored by the facts supporting their theory that an opportunity for productive settlement discussions will be lost, or an unrealistic valuation of the case will prevent resolution.

The confirmation bias of the juror

If a case reaches trial, another source of confirmation bias will be found with the jury.  Jurors bring with them various biases, preexisting views, and life experiences about the legal system, parties, and overarching case issues before ever stepping into a courtroom.  For example, in civil cases, jurors’ attitudes about issues such as corporate conduct, personal responsibility, and damages can affect their interpretation of the evidence, attitudes about parties and witnesses, as well as their ultimate verdict decisions.  Confirmation bias will affect how each juror evaluates, interprets, and remembers evidence and will ultimately play a role in how a case is decided.  Research has shown that even if jurors believe they will be fair and impartial and can set aside their preconceived notions, they will still make decisions based upon these unconscious biases.  Confirmation bias causes jurors to bolster their preexisting beliefs and cast aside those which do not fit with their case narrative.