Databases and Chill

The Daily Telegraph reports that police are taking the DNA evidence of kids as young as ten, in an attempt to 'dissuade youths from committing offences in the future'. In the words of one officer:

"It is part of a long-term crime prevention strategy. If you know you have had your DNA taken and it is on a database then you will think twice about committing burglary for a living."

The police officer in question may well be right that the knowledge that one's DNA is on file might well chill criminal behaviour. But might it also chill other sorts of perfectly legitimate behaviour? Particularly if your innocence has not been enough to prevent your DNA from being taken.