A star witness for the prosecution could make things uncomfortable for a defendant. Not every witness that makes statements in a New York courtroom is credible, though. Eyewitness testimony and evidence might suffer from flaws. Such flaws may be so egregious that a prosecutor’s case ends up falling apart. Eyewitness testimony is sometimes far from perfect and, possibly, not true.
The trouble with eyewitness testimony
One problem with eyewitness testimony centers on people suffering from faulty memory or misjudging what they saw. Security camera footage may reveal someone entered a building at a specific time. The footage shows the person’s face clearly, and there are no mistakes about who the person is.
A person trying to recollect the events may sincerely believe he or she saw a specific person enter the premises at a particular time. However, a strong alibi suggests the witness is mistaken entirely. Hence, the testimony may lose significant value.
Other issues could arise that cast doubts on witness testimony. An older person may suffer memory issues or misremember details, for example. Problems with the testimony may render it dubious.
The flaw of human memory in criminal prosecution
District attorneys often rely heavily on eyewitness testimony to prove guilt beyond a reasonable doubt because it can seem like direct evidence. However, human memory does not work like a video camera that records events perfectly.
Instead, memory is reconstructive and can become distorted over time. In addition, when a person experiences a stressful event or sees a weapon, the shock can greatly reduce their ability to remember important details.
Scientific factors that undermine witness credibility
There are several elements that can affect eyewitness testimony, making it less reliable than people often assume. Even when a bystanders believes they are telling the truth, memory can change over time and be influenced by the following conditions:
- Time delays: Long gaps between the event, police interviews and court testimony can weaken memory and replace details.
- Obstructions and poor conditions: Low light, distance or hearing problems can reduce what someone notices at the time.
- Inattention and distraction: People may miss key actions when things happen fast or without warning.
- Bias and grudges: Personal motives and old disputes can shape how a witness understands what happened.
- Influence: Leading questions, biased photo lineups or flawed police steps can change what a witness remembers.
For these reasons, courts must consider eyewitness accounts carefully and alongside other evidence to get a more accurate view of the incident.
Mistaken identity vs. intentional perjury and coercion
Witnesses can also give false information for different reasons through an honest mistake or by committing perjury. Sometimes a person can truly believe they saw the right suspect, but poor lighting, stress or a brief look at the event can lead to mistaken identity. In other cases, a witness may lie on purpose.
False statements can also happen when police use coercion or other aggressive methods to push someone into saying it. Digital evidence like video footage and phone recordings can often show what really happened and help reveal whether the bystander’s error was honest or intentional.
Falsehoods on the stand
Situations may arise when a witness outright lies. Reasons for providing false testimony will vary. Some witnesses could lie to draw attention away from wrongdoing. Others could hold a personal grudge against the defendant. Regardless, a person providing false testimony might make inconsistent statements that destroy credibility. Hopefully, the court sees through the falsehood.
Did the police coerce a witness into making false statements? If so, then the testimony may get thrown out, and law enforcement personnel could be the next to face charges.
A criminal defense attorney could challenge eyewitness testimony and accounts. The attorney may also advise the client of options when the witness’ testimony appears to fall apart.
How defense attorneys challenge witness testimony in court
A lawyer can use cross-examination to point out inconsistencies in a witness’s statements and show that the story has changed over time. In New York, defense attorneys can also challenge unfair or suggestive police lineups at a Wade hearing. They may also bring in expert witnesses to explain how memory can fail, how cross-racial identifications can cause mistakes and how stress can affect memory.
Eyewitness testimony can sound convincing, but it is not always accurate. By exposing its weaknesses, a skilled defense attorney can reduce the impact of a star witness and help ensure the verdict has a basis on reliable evidence, not assumptions. For those facing a criminal case that hinges on an identification, seeking legal guidance early can make all the difference.