Ironically, a two day case by case hold may be more valuable now than it has ever been. A couple years after Regulation CC took effect, a Fed study indicated that the average return time for a local check was 2.2 days; i.e. the Fed acknowledged in Congressional testimony that it had no tangible value.
Now that the clearing system is accelerating...
As Brenda says too, it gives you a chance for a second look, an opportunity to call the drawee bank...it may be no more worthless now than it ever was.
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In this world you must be oh so smart or oh so pleasant. Well, for years I was smart. I recommend pleasant.