Failed a pre employment dot drug test for a 141 school with a LOA to do air tours. Failed for THC with 77 nanograms. I just got a letter 4 months later saying my medical has been emergency revocated. I did receive a letter from FAA saying I was being investigated a few weeks after the positive test. Immediately after receiving that letter I went to a DOT Substance Abuse Provider and had an assessment. I completed her treatment on January 12 and forwarded this information to the FAA investigators. I didn't hear anything until my AME (who I notified when this happened) went trying to get details on what we would need for a medical. They said it had been revocated on January 19,2016. I call the lawyer in charge of my case (info from AME who called OKC) and ask if my medical had been taken. Her response was no it has not been taken at the current time and that it was a mistake. Well a week later (March 29) I get a email from the same lawyer lady saying that my medical had been emergency revocated. My question is has anyone been through this? What are my chances of getting a special issuance? Is it worth fighting via appeal? I have appealed emergency order and revocation order as well. Already sent my medical in to the FAA. I am a CFII that really wishes he never touched that dreaded substance on my honeymoon in Colorado. Any professional opinions would be awesome. I just want to fly again and hopefully instruct. Sent 3 students on checkrides after dot SAP cleared me all with passing rides BTW. Please help!