[londons_explore]

Is there a legal basis for the jury duty selection process?

It is it just custom and the court can decide any procedure for selecting a jury pool from the population? And if so, random selection from the mall would be one such method...

[SkittyDog]

Can't speak for Canada, but in the US, the jury process is a mix of black-letter law (explicit legislative acts) and administrative law (rules made by the court system under broad powers granted to it by legislation).

Tradition and precedent were the inspiration for a lot of modern law, but we explicitly re-implemented most of it via legislative and/or administrative law.