  We compare the DAMA signal to the muon flux underground, which is annually
modulated due to temperature variations in the stratosphere. We show that the
muon flux at LNGS and the DAMA signal are tightly correlated. Different
mechanisms were proposed in the literature by which muon-induced events may
dominate the signal region in DAMA. We discuss simple statistical constraints
on such mechanisms and show that the DAMA collaboration can falsify the muon
hypothesis, if it is wrong, by reporting their annual baseline count rates.
