  Dispersion relations for the scattering of hadrons are considered within the
framework of Quantum Chromodynamics. It is argued that the original methods of
proof remain applicable. The setting and the spectral conditions are provided
by an appropriate use of the BRST cohomology. Confinement arguments are used in
order to exclude quarks and gluons from the physical subspace. Local,
BRST-invariant hadron fields are considered as leading terms in operator
product expansions for products of fundamental fields. The hadronic amplitudes
have neither ordinary nor anomalous thresholds which are directly associated
with the underlying quark-gluon-structure. Proofs involving the Edge of the
Wedge Theorem and analytic completion are discussed briefly.
