John McDonald singles. The ball is in the air, at the very top of the picture, headed to left field.
I don't think it is possible. Thus, in order to have the correct call made as often as possible, MLB must use existing technology (super slo-mo cameras positioned expressly for replays, the PITCHf/x cameras already installed in every park, the "electronic eyes" used on the lines in tennis matches, etc.).
Also: On the NESN replay, Jerry Remy was gushing about Jason Varitek blocking the plate:
Now watch Varitek - and watch that left leg. ... Just blocks home plate!!! No chance of the foot getting in. Two great plays! The throw and the block! ... Look at that! [The replay shows Encarnacion may very well have been safe, and Remy is quiet for a full five seconds] Now the right foot might have got in, but I know the left foot didn't get in. ... What a way to end the game!Because we all know that as long as the left foot doesn't touch home plate, the runner is out.