Searches for the chiral effects (the Chiral Magnetic Effect, the Chiral Vortical Effect and the Chiral Magnetic Wave) in heavy-ion collisions have been under theoretical and experimental investigations in recent years. A three-point correlator $\gamma$, has been used to measure electric charge separation across the reaction plane. Significant background sources arising from charge/momentum conservation coupled with the elliptic flow have also been identified. Isobaric collisions are proposed to potentially disentangle the flow related background and magnetic field induced charge separation signals in heavy-ion collisions. In these proceedings, we show recent STAR results on the $\gamma$ correlator using charged hadrons and identified particles in 200 GeV Au+Au collisions. Moreover, the CME signal significance vs. background level is projected for the upcoming isobaric collisions (Zr+Zr and Ru+Ru) in 2018 at RHIC.