Radar technology for calling balls and strikes still has an average margin of error of about .5 inch per reading. This is for horizontal location, vertical location, and vertical movement (each individually) based on the Trackman and Pitchfx data from 2015-2017. This error rate fluctuates, and can be much higher at times (well over 1 inch, per reading) just like with a human. When taking the readings as a whole, the combination of error shows that a robo ump is not going to be perfect, and can make erroneous calls, just like a human ump.