I have heard different answers from representatives of the cRc and the Star-K regarding the kashrut of un-certified tapioca starch. While both agree that it requires a hechsher for Pessach, the Star-K indicates that it doesn't otherwise, whereas the cRc states that it always needs to bear a reliable kashrut indicator.
While I am not asking who is correct (that would be off-topic, as it relates to psak) I wonder how two of the three major American hechsherim can come to such radically different conclusions on such a comparatively-simple ingredient.*
Is there any exploration behind this particular type of machloket in contemporary kashrut ?
*"Simple" is a relative term, as some "simple" ingredients do indeed require a hechsher at all times, whereas others either never do or necessitate only on Pessach.