This may seem a good idea to many, particularly those involved in policing, but there are 2 reasons to be very suspicious. 1. Any system will have errors. So if your DNA gets mixed up with that of a serial criminal, then be very afraid. You will almost certainly go to prison with your claims of innocence treated with disdain, or lose your home, job and family in an attempt to prove your innocence. It won't be long before serious criminals subvert the system by bribing administrators to switch or destroy samples, or by employing DNA stooges such as drug addicts paid to provide bodily fluids for leaving at crime scenes. 2. The police in particular should view this development with suspicion. The development of so-called revolutionary technology - "network enabled capability" was used as an excuse for drastic cuts in the Armed Forces. Likewise, the Home Office will use the apparent certainty of DNA evidence as an excuse to cut back police numbers. This is an attractive idea from the perspective of a government minister, with armoured motorcade and armed bodyguards, but the more vulnerable among us will take scant reassurance from any conviction arising from DNA evidence if we have been murdered in the commission of the crime. The police force will move from being a preventative and deterrent force - with exceptions, such as protection of politicians and political intelligence-gathering - to an evidence-gathering and investigative agency.