Test of the no-signaling principle in the Hensen "loophole-free CHSH   experiment"
  We analyze the data from the loophole-free CHSH experiment performed by Hensen et al., and show that it is actually not exempt of an important loophole. By increasing the size of the sample of event-ready detections, one can exhibit in the experimental data a violation of the no-signaling principle with a statistical significance at least similar to that of the reported violation of the CHSH inequality, if not stronger. 
Guillaume Adenier and Andrei Yu. Khrennikov
quant-ph physics.hist-ph