Question

Humans share 99.9% of their DNA with each other. In 1-2 sentences, explain how DNA can be used to understand whether suspects are innocent or guilty of a crime?"

Answer 1

Investigators compare DNA from a crime scene to a suspect’s DNA profile: a close match makes it highly likely (but not absolutely certain) that the suspect contributed the biological material, while a non‑match can exclude them. DNA evidence is probabilistic and must be interpreted with population statistics and alongside other evidence because contamination, laboratory error, or close relatives can complicate conclusions.