How 'DNA' testing works

n a tiny sample of just 100 to 200 cells. The steps scientists take to implicate or exonerate suspects: Collect biological materials from the crime scene and the suspect under investigation, such as blood, hair, semen or saliva. Every cell is a unique library of DNA sequences. The goal is to find out if the forensic and suspect’s samples match. Isolate pure DNA by mixing the sample with chemicals that break down other cellular material. DNA molecules consists of paired filaments that interlock like zippers, and each filament is made up of chemicals “bases” (A, C, T and G) aligned in unique s