Debiasing the Law: How Understanding Cognitive Biases Leads to a More Just Legal System

• Citation: Vol. 51 No. 1
• Year: 2025

Debiasing the Law: How Understanding Cognitive Biases Leads to a More Just Legal System Vol. 51 No. 1 Pg. 37 Vermont Bar Journal Spring 2025

Debiasing the Law: How Understanding Cognitive Biases Leads to a More Just Legal System

by Gleb Tsipursky, Ph.D.

Lawyers strive for fairness and justice in every case they handle. However, the behavioral science research shows that human reasoning in legal contexts is inherently flawed and vulnerable to both explicit and implicit biases. Cognitive biases, as they are known, can significantly impact legal matters such as employment law, jury selection, public procurement, criminal defense, business decision-making, bankruptcy, and police misconduct. It is therefore crucial for legal professionals to understand and address these biases to ensure the integrity of the legal process.

The Rhyme-As-Reason Effect: A Lesson from the O.J. Simpson Case

One of the most prominent examples of cognitive bias in legal proceedings is the famous defense from the O.J. Simpson trial: "If it doesn't fit, you must acquit." This statement, which has since become a part of legal folklore, is a prime example of the rhyme-as-reason effect, a cognitive bias where phrases that are easier to process— known as having cognitive fluency—sound more believable to the human mind.

The O.J. Simpson trial, held in 1995, was one of the most publicized criminal trials in American history. Simpson, a former professional football player and actor, was accused of the brutal murders of his ex-wife, Nicole Brown Simpson, and her friend Ronald Goldman. The case was filled with dramatic moments, but perhaps none more so than when Simpson tried on a pair of gloves allegedly used in the murders. The gloves appeared to be too small for Simpson's hands, leading to the now-infamous phrase by defense attorney, Johnnie Cochran: "If it doesn't fit, you must acquit."

This statement is a classic example of the rhyme-as-reason effect. This cognitive bias suggests that if a statement or argument is presented in a way that is easy to process or understand, such as rhyming, it is more likely to be perceived as true. The defense team in the Simpson trial used this cognitive bias to their advantage, crafting a simple, memorable phrase that resonated with the jury. The phrase was catchy, easy to remember, and it simplified a complex legal argument into a straightforward, easily digestible concept. This ultimately contributed to Simpson's acquittal.

As legal professionals, it is crucial to understand the role of cognitive biases in the courtroom. These biases can subtly influence the decision-making process, swaying the opinions of jurors, judges, and even attorneys themselves. The rhyme-as-reason effect is just one of many cognitive biases that can impact legal proceedings.

Anchoring: The Impact of First Impressions

Another pervasive cognitive bias in legal settings is anchoring. Anchoring is a cognitive bias that refers to the human tendency to rely heavily on the first piece of information encountered (the "anchor") when making decisions. Once an anchor is set, all subsequent...