Investigates partners who commit crimes, including two cab drivers, and a new DNA technique that can extract clues from four-year-old evidence.


  • {S}04.{E}03. Scattered Clues

    S04.E03. Scattered Clues

    Explores three murder cases in which investigators secured convictions from trace evidence, including fingerprinting, fibre analysis and DNA testing.
    Duration: 44 Min
  • {S}04.{E}04. Natural Witness

    S04.E04. Natural Witness

    Features investigations in which natural clues, including insect bites, cat hair and a rare form of bacteria helped forensic scientists solve murders.
    Duration: 44 Min
  • {S}04.{E}05. Tainted Trust

    S04.E05. Tainted Trust

    Three cases illustrate how poison, including arsenic and potassium chloride, can be used as a murder weapon.
    Duration: 43 Min
  • {S}04.{E}06. Presumed Dead

    S04.E06. Presumed Dead

    Three cases illustrating the extreme measures investigators take to catch a killer when a missing person is presumed dead but no body can be found.
    Duration: 43 Min
  • {S}04.{E}07. Till Death Do Us Part

    S04.E07. Till Death Do Us Part

    An examination of what happens when lovers turn on each other, and ruthless spouses find a grisly way to gain an uncontested divorce.
    Duration: 47 Min
  • {S}04.{E}08. Cold Cases

    S04.E08. Cold Cases

    Investigates murder cases that took a decade or more to solve and how detectives can solve such cases when clues have become scarce.
    Duration: 47 Min