I'm Brazilian and I'm not aware of any political system where politicians have to justify the bill they're proposing, so, this might be some trivial stuff out there.
Let's suppose you're required to back up your proposition with studies and results expected.
1) How would that change the incentives regarding the dynamics on voting inside Congress?
2) Can this affect how public policies are assessed?
Example: Congressman John Doe wants to change the regulation regarding drinking and driving. People treated by public hospitals with injuries due to driving drunk will have to pay for the their treatment. He must present studies to support his ideas and long term results expected with that change.
How can one investigate (literature) further on this being a good incentive on bills overall quality? No justification is better than forcing people to present their thoughts on the outcomes of their proposition?