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Shadow home secretary David Davis called for a Parliamentary debate and described the system for adding people to the database as arbitrary and erratic. Nick Clegg, Liberal Democrat home affairs spokesman, said there was "no earthly reason" why someone who has committed no crime should be on the database - "yet the government is shoving thousands of innocent people's DNA details on to the database every month". The DNA database - which is 12 years old - grows by 30,000 samples a month taken from suspects or recovered from crime scenes. There has already been criticism of the database - the largest in the world - because people who are found innocent usually cannot get their details removed.