Polarization of vacuum in the decays of neutral kaons
  It is considered the state of $K^0$ before the decay as that embedded into the vacuum of $+ \bar K^0 - \bar K^0$. Since the state of $K^0_S$ has the lifeitme $\tau_S$, and the state of $K^0_L$ has the lifeitme $\tau_L$, the vacuum of $+ \bar K^0 - \bar K^0$ is polarized. Due to the polarization of the vacuum, $2\tau_S/\tau_L$ of $K^0_S$ decay with the delay $\approx \tau_L$. Thus CP-invariance holds true in the decays of neutral kaons. 
D.L. Khokhlov