[devwastaken]

There's multiple problems with that idea. Firstly, it incentivizes 'working around the system' for enforcement to go after people. Enforcement is not inherenetly out there for the 'good', many times they're there for their own agenda, while looking like they're enforcing the law. This can create a mixture of criminal/enforcement culture, and lead to a further increase of 'bad cops'.

Secondly, when gathering evidence illigally, it may be that the evidence is purely out of context, shaped to make the person look guilty, or that the methods of doing so are not reliable. Courts still have a problem with reliability of evidence, even 'lie-detectors' are still seen as legitimate, but there is no evidence of their ability.