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A further area of weakness common to many of the models is the investigation of many complaints by the same police force as the officers who are the subject of the complaint.
To speak plainly, complaints that are, by definition, vexatious or frivolous will jam up the system. Members will be aware that many complaints that are submitted fit that definition, and many of us would recognise that, from time to time, so are some of the messages in our inboxes.
You would need enormous data sources to be able to do that because the problem is that the way in which people can respond to tax is so complex—there are many dimensions to it. I have referred before to the fact that we tend just to look at taxable income, but that can be the outcome of many, many decisions that people make.