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  Season 4
    
  
  
  
  
  
    
  
    When eight-year-old Sarah Payne is murdered, a pollen expert finds a vital link between the suspect and the grave. In another case, a blood spatter expert is called when a body is found in a freezer.
  
When eight-year-old Sarah Payne is murdered, a pollen expert finds a vital link between the suspect and the grave. In another case, a blood spatter expert is called when a body is found in a freezer.
   
  
  
  
 
    
  
  
  
  
  
    
  
    A twisted killer throws two suitcases containing severed remains into a canal, and it’s down to a 3D-scanning expert to uncover the crucial evidence needed to convict him.
  
A twisted killer throws two suitcases containing severed remains into a canal, and it’s down to a 3D-scanning expert to uncover the crucial evidence needed to convict him.
   
  
  
  
 
    
  
  
  
  
  
    
  
    When a body is found in a wheelie bin in a lake, a cell site analyst tracks the suspects’ mobile phones. And when a man disappears, a soil expert helps identify his killers.
  
When a body is found in a wheelie bin in a lake, a cell site analyst tracks the suspects’ mobile phones. And when a man disappears, a soil expert helps identify his killers.
   
  
  
  
 
    
  
  
  
  
  
    
  
    When a killer gang use a secret language to discuss an attack, police turn to a forensic linguist. And a huge cannabis operation is brought down with the help of a drugs expert.
  
When a killer gang use a secret language to discuss an attack, police turn to a forensic linguist. And a huge cannabis operation is brought down with the help of a drugs expert.
   
  
  
  
 
    
  
  
  
  
  
    
  
    Untying the knot of a dressing gown cord used to kill a woman in 1984 finally reveals the perpetrator. And expert analysis of muddy shoes helps find the murderer of a missing student.
  
Untying the knot of a dressing gown cord used to kill a woman in 1984 finally reveals the perpetrator. And expert analysis of muddy shoes helps find the murderer of a missing student.
   
  
  
  
 
    
  
  
  
  
  
    
  
    In a case of mistaken identity, a man is stabbed to death. An intelligence analyst helps convict the killers, and a trace evidence expert helps find the weapon used to kill a teenager.
  
In a case of mistaken identity, a man is stabbed to death. An intelligence analyst helps convict the killers, and a trace evidence expert helps find the weapon used to kill a teenager.
   
  
  
  
 
    
  
  
  
  
  
    
  
    Thirty years after six-year-old Rikki Neave was murdered, a soil expert helps convict his killer. And a wildlife forensic scientist helps police in an illegal ivory investigation.
  
Thirty years after six-year-old Rikki Neave was murdered, a soil expert helps convict his killer. And a wildlife forensic scientist helps police in an illegal ivory investigation.
   
  
  
  
 
    
  
  
  
  
  
    
  
    After fire crews find a body in a burning flat, a blood spatter analyst uses an untested method to find key evidence. And a cold case is solved using familial DNA for the first time.
  
After fire crews find a body in a burning flat, a blood spatter analyst uses an untested method to find key evidence. And a cold case is solved using familial DNA for the first time.
   
  
  
  
 
    
  
  
  
  
  
    
  
    After a teenager is found dead in the woods, a pathologist analyses her stab wounds to shed light on the attack. When remains are found in Scotland, a crack team of experts nail the killer.
  
After a teenager is found dead in the woods, a pathologist analyses her stab wounds to shed light on the attack. When remains are found in Scotland, a crack team of experts nail the killer.
   
  
  
  
 
    
  
  
  
  
  
    
  
    The fatal shooting of Olivia Pratt-Korbel in Liverpool. An image analyst helps detectives unmask the killer. And two experts help police convict thieves who stole ancient treasure.
  
The fatal shooting of Olivia Pratt-Korbel in Liverpool. An image analyst helps detectives unmask the killer. And two experts help police convict thieves who stole ancient treasure.
   
  
  
  
 
    
  
  
  
  
  
    
  
    A mother and her son vanish in 1976, leaving just a burnt-out car. Forty years later, a blood analyst helps police find out the truth. And a phone analyst helps find the killer of a drowned man.
  
A mother and her son vanish in 1976, leaving just a burnt-out car. Forty years later, a blood analyst helps police find out the truth. And a phone analyst helps find the killer of a drowned man.
   
  
  
  
 
    
  
  
  
  
  
    
  
    Rachel Nickell was murdered in 1992. Ten years later, a team using new DNA technology finally identify her killer. In another case, a trace expert uses beer glass fragments to find an assailant.
  
Rachel Nickell was murdered in 1992. Ten years later, a team using new DNA technology finally identify her killer. In another case, a trace expert uses beer glass fragments to find an assailant.
   
  
  
  
 
    
  
  
  
  
  
    
  
    A young boy is murdered, but his killer is not found. Thirty years on, a pollen expert finds crucial evidence. And a blood and fibre analyst helps find the killer of a shopworker.
  
A young boy is murdered, but his killer is not found. Thirty years on, a pollen expert finds crucial evidence. And a blood and fibre analyst helps find the killer of a shopworker.
   
  
  
  
 
    
  
  
  
  
  
    
  
    A disabled woman is murdered, and her neighbour is the prime suspect, but it takes a doctor to help put him in jail. And a linguistics expert helps convict a man stalking his ex.
  
A disabled woman is murdered, and her neighbour is the prime suspect, but it takes a doctor to help put him in jail. And a linguistics expert helps convict a man stalking his ex.
   
  
  
  
 
    
  
  
  
  
  
    
  
    The 2005 murder of a Glasgow woman goes cold, but 17 years on, a Dutch soil expert helps convict the killer. And in another murder case, a blood analyst uses an unusual technique to crack the crime.
  
The 2005 murder of a Glasgow woman goes cold, but 17 years on, a Dutch soil expert helps convict the killer. And in another murder case, a blood analyst uses an unusual technique to crack the crime.
   
  
  
  
 
 
  
     
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