I am so glad I am not the only one that this has happened too! My doctors office just told me today that they can’t refill my Ritalin because the drug test for Amphetamines comes back negative. I felt like my integrity is being challenged. I take it exactly like I’m supposed to or I’m all over the place. I called the dr’s office back and her nurse said I have to make an Appt. with my dr. to discuss it so I did. Thanks for the info!