Because the DEA are doing the job they want to do but know they can't get away with. DEA as of right now can get away with it because of "Transition confusions."
I just moved back to missouri from sacramento and i have admit that the medical cannabis system is wrought with problems. The doctors work for the cannabis clubs essentially, and there is llittle to no checks and balances. i am all for full legalization but there needs to be an effect system put into place like the tabacoo and alcohol industries. The medical system they have set up is a step in the right direction but also a step backwards due to the criminal influences. There are some good friendly co-ops but mostly it is run by gangs and cartels.