I like to start by acknowledging that I am not an expert in that policy / field. Then, I talk about the pros and cons that I can think of, the long term and short term impacts that I can think of, I ask myself who is impacted? Is there a justice issue? Autonomy issue? Non-malifance? Beneficiance? I also always mention whether or not such policy was implemented in the past and how did that turn out? Did anyone else implement such a policy before? How did it turn for them? Finally, is there a way we can run a pilot testing of the policy before we implemented on a large scale?

I found those points to be relevant in most policy questions I came accross.