The people in your prisons are your transporters and your hard core drug addicts, not your casual tokers.
around here it's handled like a traffic ticket for less than an oz, however when I lived in missouri I worked with a guy (19 yrs old) who did 6 months in county for a piece of tin foil with some resin on it. (rolled up the foil for a 1 hit pipe to smoke maybe a 1/4 gram)
as far as the money dedicated to it, we have had huge budget problems around here the last couple years. they have laid-off some of the OSP. we even had a few months where they quit prosecuting property crimes if they where under a certain dollar amount. (mostly car stereo theft and the like)
but all through that time when they wouldn't prossecute or even arest those guys, the pot busts just kept comming, bussines as usual.
when making funding cuts crimes with victims should be the priority for enforcement, the local bicycle theif should be an arest priority above someone growning pot.
as a taxpayer I'd rather they let that guy grown his dope and spend some time finding the dirtbag who took the stereo outta my jeep.
and in oregon they grow some of the worlds finest weed (I've been told
). and since the fishing and logging have gone to hell it's likely our biggest cash crop. why not tax it and use the money for something worth while instead of all the money staying in the drug trade (either in the hands of dealers or in the hands of enforcement)
the other cost is that it puts a huge segment of our society seeing the cops as 'the enemy'. how much easier would the cops job be if your average guy on the street was glad to see him come by. as it is the drug laws turn kids against cops at a young age. they see friends and niegbors arested for crimes where they have hurt no one, while on the other hand when crime effects them (bike stolen or the like) the cops have more important things to deal with.
I'd be currious to see the budget for my (or any major cities) cities police department, how many of our police dollars are spent on property crimes, and how much on drug enforcement.