our law of physics couldn't allow this because the more we approach the speed of light, the more we gain mass. E=MC2 also supplemented the idea. but lately a neutrino was found to have broken the speed of light cosmic limit and had an uproar of the entire scientific community. right now, they were trying to revisit the postulation by doing going into the usual culprits like GPS calibration to atomic clock, the consideration of the progression of acceleration, the vacuum bombardments(vacuum isn't absolutely empty, it has particles per square inch causing quantum fluctuations).
we will let you know the progress of this abstraction.