Because it has been almost a year. I have a student who keeps a bottle in my office, with doctor's orders, for ADHD. I came in last Friday to find it broken on my desk, smelling to high heaven. Cleaned my desk multiple times and the smell still lingers. I am gagging here. Funny side note, the doctor's order stated "the parents seem to think this helps, so pt may apply as needed". That is one nice doctor.