Wasted on the Way Lyrics. Look around me. I can see my life before me. Running rings around the way. It used to be. I am older now. I have more than what I wanted. But I wish that I had started.
The short answer is yes.. A pharmacist may refuse to fill a prescription if they feel it is illegal, medically inappropriate, or you are drug seeking (see the previous, fairly comprehensive answer for details of the statute and regulations).
Just present a copy of your doctor's prescription or bring the bottle (with your name as the patient) to the folks who are doing the testing, it really doesn't matter how long it stays in your system since you're most likely taking it legally.