You would need to come up with a study that has a wholly separate cause for the documented rise in crime and drug use
No I wouldn't - I would only need to note that all sorts of factors influence crime rates and drug use ... and that the press reports don't even say that crime rates and drug use hadn't been increasing before depenalization of cannabis.
Your opinion on the three studies is invalid due to your fanatical defense of drug use.
You crave drugs, so you reject all studies that show the great harm of drug use.
In the past weeks I have seen other FReepers note how you frequently push the pro-drugs agenda.
In short - you are unqualified to give any reasonable opinion on the subject.