More consenting adults being arrested for consenting. More taxpayer dollars being spent on imprisonment and enforcement than less expensive treatment, not to mention the opportunity cost of lost profits from taxation.

When are we going to realize that the drug war for most drugs is fucking bullshit?

DPR may have gone away but if the law doesn't change eventually, the nerds WILL figure this problem out. You say the weakness this time was the postal system? Well here comes APOD, Anonymous Physical Object Delivery https://www.cs.columbia.edu/~smb/papers/APOD_PETS09.pdf

And lest we forget, here's a statement from http://en.wikipedia.org/wiki/Global_Commission_on_Drug_Polic... :

In June 2011, the Global Commission on Drug Policy released a critical report on the War on Drugs, declaring "The global war on drugs has failed, with devastating consequences for individuals and societies around the world. Fifty years after the initiation of the UN Single Convention on Narcotic Drugs, and years after President Nixon launched the US government's war on drugs, fundamental reforms in national and global drug control policies are urgently needed."