How DNA test can establish guilt or innocence

Esther Ng’eno, 80, lived alone, but when neighbours didn’t see her for a few days, they broke into her house and stumbled upon a shocking scene, she had been raped and strangled to death.

There was no witness to the killing, and appeared as another hopeless case to follow up.
How investigators eventually identified the suspect is credited to forensic technology that experts want the Government to adopt to keep criminals on a short leash.