the problem is it has to be beyond reasonable doubt.. cant use previous convictions... one word against the other is not beyond reasonable doubt... the fact its obvious he is guilty is not enough to get it into court. CPS have to agree to prosecute and in this sort of case with no supporting...
you brother is allowed to ask for the decision not to charge to be looked at under new guidelines that came into effect at the start of May.the case must be reviewed by somebody higher in rank than the person who decided to take no action. the officer must then give the results of their review...