Which of the following is considered a tool used in forensic investigations?

In forensic investigations, multiple tools are employed to gather and analyze evidence to solve crimes. DNA analysis, a powerful technique, helps identify individuals based on their unique genetic makeup, making it invaluable in criminal cases where biological evidence is present. Fingerprint analysis is another critical tool that relies on the uniqueness of individuals’ fingerprints to link suspects to crime scenes or exclude innocent parties.

The polygraph test, or lie detector test, assesses physiological responses to determine whether a person is being truthful. While it is used in some investigative contexts, it is not always considered definitive evidence in a court of law due to questions about its accuracy and reliability.

Since all these tools—polygraph testing, DNA analysis, and fingerprint analysis—play roles in investigative procedures, the inclusion of "All of the above" as the answer reflects the fact that each contributes differently to forensic investigations. This makes the answer valid as it acknowledges the diverse range of techniques utilized in the field of forensic science.