Justifying a local hidden variable theory requires an explanation of Bell's inequality violation. Ever since Bell derived the inequality to test the classical prediction on the correlation of two spin-1/2 particles, many experiments have observed the violation, and thus concluded against the local realism, while validating the non-locality of quantum entanglement. Still, many scientists remain unconvinced of quantum entanglement because the experiments have loopholes that could potentially allow a local realistic explanation. Upholding the local realism, this paper introduces how a precession of the spin would produce a cosine-like correlation function, and furthermore how it would also contribute to a fair sampling loophole. Simulating the precession in Monte Carlo method reveals that it can explain the observed Bell's violation using only classical mechanics.