Limitations of the CQMI method to assess causality of s-parameters

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yefj

Hello , I am frequently using CQMI to see if my s-parameters are casual however I was told the CQMI can give false results.
What is the cases where I should not rely on CQMi?
https://resources.altium.com/p/ieee-p370-standard-high-speed-pcb-interconnects
Thanks.

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