Then it would be a great thing to have. It would lead to reduced crime and make it harder for innocent people to be convicted of crimes they did not commit. The benefits could be huge, alas it's the people in charge who cannot be trusted.

And do they create new legislation to punish those in power who are corrupt? No.

Are they special protections for whistleblowers? No.

Going on past behaviour of people in power, including police and politicians, leads me to conclude we cannot trust them. There will be mistakes as well as deliberate miscarriages of justice.

DNA should always be collected at every crime scene, because it could mean that the innocent accused party could show that it's not their DNA.

Likewise it could mean that someone who is guilty does get convicted, like the man who was convicted this week for killing the schoolgirl in Scotland. The DNA from the girl's purse was his child's DNA.

Miscarriages of justice, when was the last time you heard of any of the police or lawyers involved being convicted of their crimes? No wonder we can't trust them completely.