Can an Electromagnetic Violation of Time-Reversal Invariance be Observed in Low-Energy Nuclear Processes?

Starting from a $T$-odd Lagrangian involving the nucleon, meson, and electromagnetic fields interacting at a point, we calculate the one-meson-exchange diagram and obtain the longest-range part of a two-nucleon electromagnetic operator. Even if this interaction were present with "maximal" strength, we would not expect $T$-invariance violation to have been seen in any of the existing $E2\mathrm{}-M1\mathrm{}$ interference experiments including ${}_{}{}^{36}{}_{}{}^{}\mathrm{Cl}$ which has the smallest gap between model and experiment.