I haven't seen it, I may watch it next time I'm bored and looking for something different. I have read about it, and agree with Jordy, some things I could see happening:
* As hinted at in reading material, weathly people would be the least impacted because they can afford protection.(The really weathy would be on yachts outside US territory for 24 hours).
* Theft not murder, might become the most common crime (in some cultures today it is considered just a normal part of life).
* A lot of "crime" would happen in poorer neighborhoods.
* I would assume this would encourage gun ownership, no matter the laws.
* Some gangs would use this to get a better stranglehold on a territory.
* Other gangs would use it to wipe out revival gangs.
* Many citzens would end up banding together for protection, as they did before the law was organized.
* All sorts of "side businesses" would pop up to take advantages of the negatives or postives that could be found.
This list speaks to Siggy's original thought: "In my opinion, this movie was about psycho-social, politico-economics issues."