  We present general constraints on dark matter stability in hadronic decay
channels derived from measurements of cosmic-ray antiprotons.We analyze various
hadronic decay modes in a model-independent manner by examining the
lowest-order decays allowed by gauge and Lorentz invariance for scalar and
fermionic dark matter particles and present the corresponding lower bounds on
the partial decay lifetimes in those channels. We also investigate the
complementarity between hadronic and gamma-ray constraints derived from
searches for monochromatic lines in the sky, which can be produced at the
quantum level if the dark matter decays into quark-antiquark pairs at leading
order.
