The judicial branch is part of the checks and balances  in the system...and yeah when the people vote in something that is unconstitutional, the courts can toss it out...the founding fathers were wary of the tyranny of the majority...like the two wolves and a sheep voting on dinner...

There are pretty fundamental rules about who you can sue and when...You'd likely need more than just an underage driver to hook any negligence on the retailer...and youd still need to show somehow that the sale of the weed was a contributing factor  in the collision...which could be difficult to impossible...Now the state may attempt to create something similar to the dram shop/liquor liability laws...but again it would be difficult to prove what you'd need to prove to prevail.......and in Alaska you have no direct action against a 3rd party's insurer....so they would be out in the first 10 minutes of the lawsuit....and billing you for their expenses....so would the state...and the feds...