Upmc pre employment drug test Pittsburgh- do they disqualify MMJ patients p?

I have a drug screen for a job coming up and I am a medical marijuana patient. I’ve been abstaining but I am still testing positive on a home test, I’m worried that this is going to disqualify me from the position. I’m afraid to even disclose it based on some of the conflicting information I’ve seen online Has anybody recently taken a job with UPMC that might be able to shed light on their MMJ policy?