The police association is hopeful that under a proposed law change, which would allow police to take DNA samples from suspects, would enable them to catch more criminals.

As of now, the samples from DNA can only be gathered when a person is convicted, or the high court has approved it.

According to the Police, at most crime scenes, a DNA sample is left behind and thus the latest law would make it easy for them to trap more serious criminals.

"Taking DNA is a less invasive procedure than fingerprinting, and it can be done very quickly," said Association president Greg O'Connor.

It has been learnt that on Wednesday, the legislation is expected to pass its first stage at parliament.