stevei wrote:
What I don't understand is how the police are allowed to exercise discretion when they have proof that the law was broken. I recall a case that was prosecuted (nothing to do with motoring) where most people thought they should have simply left it alone. Without going into the details of the case, the police defended their actions by saying that, in general, when they become aware that a crime has been committed, they have a moral responsibility to pursue a prosecution. So, if a camera van is recording the speed of every car that is targeted by the operator, but only drivers who are above a threshold are prosecuted, I don't understand how the police can justify this. They have proof, on tape, that a crime has been committed, e.g. a driver was doing 33 in a 30 limit, but they don't prosecute because their threshold was arbitrarily set at 35. If they did the same thing for assault, say, people would be outraged - "Oh, yes, we accept that you were mugged in the street, but we won't prosecute because they didn't injure you seriously enough or steal enough money from you".
This recognises the "line in the sand" nature of speed limits which is very different to most other offences.
However, there are plenty of other examples where the police decline to prosecute despite knowing that an offence has been committed, for example in only very rarely prosecuting the fathers of children conceived by girls under 16.
Discretion is an essential part of police work - any police officer on patrol (whether traffic or not) will routinely see offences committed which he decides not to prosecute.
And total zero-tolerance speed enforcement would create the conditions for a revolution
