Passing on calls? Is this true?

[redoubtable1]

My sis has been a ref for 8 years and she is an excellent official. We have discussed this and she says that she uses a "did the player gain an unfair advantage" standard. I just don't buy that refs use a "pass on calls" standard. It is hard enough winning games without us coaches sitting on the sideline wondering, "Did he pass on that call?" I buy my sister's explanation better.