Detectives said they were hoping to create a DNA profile of whoever killed the teenagers.
Officers said a DNA profile and a palm print identified Alisa's remains, which were found in a copse.
Scientists hope to extract a DNA profile that could be used to study the development of plague since then.
Officials also were entering the DNA profile into a national database to see if it links him to other crimes.
They later recovered Johnston's DNA profile not only from the bed sheets and duvet, but also from the victim herself.
The French trawler found his body off the coast of Newhaven and a DNA profile was taken in April 2011.
In addition, a further partial DNA profile was recovered from inside one of the mobile phones left abandoned in the car.
The investigation was given a kick-start last autumn when new technology allowed a DNA profile to be built up from material found on Pauline's clothing.
And mapping a dna profile allows the company to sell the genetic fingerprint to well-heeled Arowana fanciers for thousands of dollars extra, like a racehorse pedigree.
It was not until 1999 that the Forensic Science Service (FSS) developed technology to enable its scientists to find a full DNA profile of Marion's killer.
It is understood that envelopes from the letters may still exist - raising the possibility they could provide a DNA profile of the hoaxer through saliva traces.
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In fact, CODIS doesn't even contain an individual's DNA profile.
The prosecution also claimed that a low-level mixed DNA profile from Mr Shivers was also uncovered from a third used matchstick which was found on the roadway near the car.
But after advances in DNA technology, the police decided to approach men seen during the initial investigation and asked them to provide a mouth swab which was then compared with the DNA profile.
The Home Office told BBC News Online that the Data Protection Act and the European Court of Human Rights considerations had to be fully taken into account before DNA profile information could be released overseas.
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The fact that a DNA profile could be matched against any remains found helped to persuade the authorities to allow a dig beneath a council car park, beneath which documents had indicated Richard might be buried.
Only identical twins share genetic profiles on all 20 alleles, so if you get a perfect match between the DNA you find at the scene and the DNA database profile, you have very strong evidence that the person in the database committed the crime.
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She said a sample taken from flooring at the home of David Parker, 38, contained DNA matching his profile and that of fellow accused Paul Smith, 47.
Among the forensic files there was a sample of semen which was DNA tested and showed a profile matching Sinclair's.
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But this relies on the person either being among a pool of suspects identified by the police or having their profile in a DNA database.
The paper estimates that each new profile added to the US DNA database - the Combined DNA Index System, or Codis - resulted in 0.57 fewer serious offences.
He told jurors he left a green towel as a colour match which he said explained why police found a minor trace of DNA on the towel which matched his profile.
The Association of Chief Police Officers examined a set of homicide and rape cases from last year in which a DNA match had been made with a profile on the national database.
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In a respect, it's even more comfortable to hold than the Droid DNA, thanks to its 6.9mm profile (at its thinnest point).
An important current approach, known as genetic profiling, involves comparing crime scene DNA with that from a suspect or with a profile stored in a database.
Wright was on the existing system after being convicted of theft in 2003, and when police found his DNA on the bodies of some of his victims they matched it with his profile.
"Once we get the sequence -- what we called the DNA profiles from the African-American that is being tested -- we compare that profile to profiles in the database, " Kittles explained.
Scientists predict this will eventually lead to an age of personalized medicine, in which a person's DNA is analyzed before treatment and he is given a cocktail of drug treatments customized for his genetic profile.
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