ΔI = rule from staggered fermions.
Abstract We present our latest results for the Δ I = 1 2 rule, obtained on quenched ensembles with β = 6.0 and 6.2, and a set of N f = 2 configurations with β = 5.7. The statistical noise is quite under control. We observe an enhancement of the Δ I = 1 2 amplitude consistent with experiment, although the systematic errors are still large. We also present a non-perturbative determination of Z P , Z S and the strange quark mass. We briefly discuss our progress in calculating e′/e.