Nishijima's model for $\mathrm{CP}$ violation introduces a divergencelike term in the strong Hamiltonian and attributes the nonleptonic weak interaction to the second-order contribution due to that term ($\mathrm{CP}$ violation arises in third order). By using a unitary scalar density plus the fifth interaction for the original strong Hamiltonian, we induce in Nishijima's weak Hamiltonian a current-current structure, somewhat similar to the conventional one. Moreover, it becomes equivalent to tadpole terms for $\left|\Delta S\right|=1\mathrm{}$. The $\Delta S=0\mathrm{}$ weak transitions are somewhat modified. We get the correct $\left|\Delta I\right|=\frac{3}{2}$ admixture from a counter term which relegates the $\left|\Delta S\right|=2\mathrm{}$ contributions to fourth order (i.e., second-order weak interactions). We find $\left|{\eta }_{00}\right|\sim \left|{\eta }_{+-}\right|$ to within 10%.

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