Its really depends on how well the monitor was calibrated. I read somewhere (yes, I do read.....
) that the earlier models of monitors you could fool by hitting the ball really low and it would register things like 300 yard drives and so on.
Like it was said earlier all depends on who is operating the monitor, ideally it should be recalibrated after every person has finished with it.
As for your kid eating boogers, tell him to stop it. Its disgusting. Replace the booger with a nice juicy piece of chicken!!
Alex