Can checked swing be a 'fourth out' appeal?

[SanDiegoSteve]

Originally Posted by Chukinrox

We all know that 95% of the time you cannot tell whether a batter swung while in the B position but would this be a proper appeal or not is the question?

I can usually determine if in my judgment the batter offered at the pitch from B or C. I would say that 95% of the time I get the call right from the middle. I do not use the position of the bat as the major determining factor on a check swing. I use my judgment in deciding if the batter actually offered at the pitch, or managed to check his swing without doing so.