This is what I'm trying to address.
The process for assessing legislation begins at an early stage, when we are presented with various options for reform. These are the subjects of legal opinions, discussions, round tables, etc. The implications, constitutional or otherwise--policy people also weigh in on these discussions--also are involved. Constitutional considerations are taken into account. Opinions are prepared and they are sent up for consideration by higher-ups and ultimately will make their way to the minister who has the final authority for deciding these things.