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Why credibility decides more than facts do
A serious criminal case rarely comes down to a single piece of physical evidence. Most of the time, it comes down to people describing what they saw, heard, or remembered. That means the outcome often turns less on what happened and more on whether a jury believes the person describing it. Both prosecutors and defense attorneys spend a large part of their preparation time on this question, though they approach it from opposite directions.
Prosecutors need to know a witness will hold up under pressure before they build a case around that witness. Defense attorneys need to know where a witness might not hold up, because that is often where reasonable doubt lives. Understanding how both sides think about credibility helps explain why trials look the way they do.
Consistency across tellings
The first thing any attorney checks is whether a witness has told the same story more than once, and whether those versions match. A witness might talk to police at the scene, give a follow-up statement days later, and then testify at trial months or years after that. Small differences are normal. Memory is not a recording device, and stress changes what people notice and retain.
But large shifts matter. If a witness changes a key detail, like who was holding a weapon or how far away they were standing, both sides will focus on that gap. Prosecutors look for an explanation that makes sense, such as recovered memory after a bystander calmed down enough to think clearly. Defense attorneys look for the opposite, a sign that the story shifted to fit a theory rather than reflect an actual memory.
Opportunity to observe
A witness can be honest and still be wrong. That is why attorneys ask basic questions before they trust an account: how far away was the witness, how long did they watch, was it dark, were they scared, had they been drinking. None of these questions accuse anyone of lying. They test whether the witness had a real chance to see and remember what they claim to.
This matters more in cases built on eyewitness identification than in cases built on documents or forensic testing. A witness who glimpsed someone for two seconds in poor light is a different kind of evidence than one who watched an event unfold for several minutes in daylight.
Motive and relationship to the outcome
Jurors are told to weigh whether a witness has a reason to shade their testimony. A witness with no connection to either side carries a different weight than one who has a personal stake in the result. That does not automatically make an interested witness unreliable. It means their account gets tested harder against other evidence before anyone leans on it.
Bracken McKey, a former Chief Deputy District Attorney in Washington County who now practices criminal defense and personal injury law at McKey Law, has spent decades evaluating exactly this kind of testimony from both the prosecution and defense sides of a courtroom. That dual vantage point is part of why experienced criminal attorneys tend to read witness credibility differently than someone encountering a case for the first time.
Corroboration matters more than confidence
One of the more counterintuitive lessons in this field is that a confident witness is not necessarily a reliable one. Confidence and accuracy do not move together in a predictable way. A witness can sound completely certain and still be wrong, and a witness can sound hesitant and still be right.
Because of this, attorneys on both sides look past tone and demeanor and search for corroboration instead. Does the witness’s account match a timestamp, a phone record, or physical evidence found at the scene? Does another independent witness describe the same sequence of events without having compared notes first? Corroboration is what turns a single account into something a jury can rely on with more confidence.
What this means outside the courtroom
Most people will never sit through a criminal trial, but the same principles apply anywhere a story needs to be checked before it is trusted. Whether it is a workplace dispute, an insurance claim, or a disagreement between neighbors, the same questions hold up: has the account stayed consistent, did the person have a real chance to observe what they describe, and does anything outside their word support it.
Bracken McKey’s work on both sides of the courtroom points to a simple habit worth borrowing: treat a first account as a starting point, not a conclusion, and look for something independent that either backs it up or does not. Bracken McKey’s career is a reminder that credibility is judged, not assumed, and that judgment gets sharper with practice on both sides of a case.
