I received a BCD, what can I do about my discharge?

PFC Robert Cummings , What part of smoking dope is against the Law and against Military Regulations did you not understand?
I read what you wrote and the replies you have received from the Officers and Noncoms that took time to reply. You have to admit it is a bit ugly. Remember the Board of Correction of Military Records, the board that will consider your request is made up of people like us... Career Military Leaders that have served honorably and by the regulations. So if you are going to submit this, you need to come up with a better story than "It was the fault of the Marine Corps because they took too long and I got bored."
That is the fact and is like the little kid that smashed all his parents stuff and then blames his mommy because she was not home to stop him and he got bored.
I am being specifically hard in this reply, showing no mercy because the board is going to do that as well, you need to be ready for that.
By the way, in the history of the Board of Correction of Military Records, I can not find one example of a characterization of Discharge that was upgraded.
You used drugs while on active duty, you got caught and you got your Big Chicken Dinner, which was I believe well deserved.

You can hope and pray, but you deserve no better than a bad conduct discharge

Yea, you can hope on a wish and a prayer. Don't expect an upgrade, though. A BCD is given at a Court Martial and is sometimes followed by prison time. If the courts found you guilty, and you were given the BCD via the jury and judge, then the evidence was there to convict you.

You were still under UCMJ, until you received your walking papers, so you really have no leg to stand on. But, thank you for serving your community as an EMT.

Were I on the review board, you'd get a no vote.

I didn't see anything in your post that indicated there was some actual mistake made in the evidence or process. You appear to have the BCD for valid and accurate reasons. Delays in the process are no defense.

You can begin at the DRB and then to the BCMR if you feel you were wonged; your case won't be considered by the Court of Federal Claims, you were ultimately in the wrong, good luck!

If you failed a drug test and got separted in a negative manner due to failing the drug test, it seems as though your separation fits your actions. What separation do you believe you should receive?