A whole bunch of those have since been positively confirmed as operator error or calibration issues. Also these cases are often from new kit the operators were

A whole bunch of those have since been positively confirmed as operator error or calibration issues. Also these cases are often from new kit the operators were unfamiliar with, I don’t see how that can be a coincidence. The fact is we should expect a certain amount of false positives. So the real question is do we see more of these cases than we’d probably get anyway.