Not to inject real-life politics, but with all the discussion going on about how the US federal government should interact with the states got me thinking about Star Trek.

The United Federation of Planets obviously has sets of laws that apply to all member worlds. Many of this might be relatively specialized, such as the issues of "telepathic rape" as not every race is telepathic.

But that got me thinking - what happens when new worlds and civilizations join the Federation? Is part of the application/approval process Federation lawyers sitting down and reviewing their legal code to look for new laws that they have created that would need to be added to the Federation Legal Code? I would assume any conflicts would be handled as the US currently handles it - if laws conflict between the Federation as a whole and a member world, Federation law trumps it (Supremacy Clause)

But is this ever discussed in primary or secondary canon?