[en] rho^+- photoproduction from hydrogen and deuterium at 9.6 GeV is studied. The reactions γp→p⁺n and γp→p^-Δ⁺⁺(1236) have cross sections much larger than expected from pion exchange alone. t distributions do not show the sharp forward peak characteristic of one-pion exchange contributions. Density matrices indicate an isotropic decay distribution. The ratio of rho⁺ to rho^- production on deuterium differs from unity and by the amount expected from interference between rho and A₂ exchanges. We conclude the π exchange is unimportant for rho^+- photoproduction, and infer that rho exchange dominates