In an extraordinary attack, the Magistrates’ Association said it is a “certainty” that officers will misuse powers because they cannot be “relied on” to handle them appropriately.
The comments have been made as part of the Magistrates’ Association response to the Government’s plans to allow police to issue £60 fixed penalties for careless driving.
Police have been accused of increasingly dealing with offences using on-the-spot fines as an easy way to hit the government’s crime targets.
Magistrates are worried that the number of offences now dealt with in this way is keeping some serious offenders out of the courts.
However, police leaders insisted that the use of the fines, which has risen sharply under Labour, helped to reduce paperwork and free up officers’ time.
It leaves two of the key bodies responsible for tackling crime and administering justice at loggerheads.
MPs expressed surprise that magistrates would have accused police of being untrustworthy.