How can polygraph tests be used in investigations?

Polygraph tests, commonly known as lie detector tests, are primarily used as a tool to assess the truthfulness of an individual regarding specific questions. In the context of investigations, they are particularly valuable for eliminating suspects from a list. When a suspect takes a polygraph test and the results indicate that they are being truthful regarding their involvement in a crime, investigators can conclude that they are less likely to be the perpetrator. This helps narrow down the list of suspects and can focus the investigation on individuals who may be more likely to be involved in the criminal activity based on the results.

This process of elimination is crucial since it allows law enforcement to allocate resources effectively and avoid pursuing suspects who have demonstrated their innocence through truthful responses in a polygraph examination. Rather than making decisions about sentencing, conducting arrests, or finalizing court decisions, which involve broader legal processes and evidence considerations, the role of polygraphs is more supportive in the investigative phase, aimed at clarifying the situation and directing subsequent steps in the investigation.