Not sure, but I would be carefull, as If you use a medical reason it could be held against you as either not wanting to take the CSVA or the fact that if you medically cannot take it you may not be able to perform the job on other functions....

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This is what the makers of the device claim. When you look for any proof or research supporting this contention, you come up empty handed pretty quickly.

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Is there any reason to believe that this test is accurate in persons free of disorders? Note that CVSA has not been shown to determine truth from deception more accurately than a coin flip in any study not financed by the manufacturer of the device.   

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I agree that this is what the maker of the device tells people. Still, I know of no peer-reviewed studies linking the voice, deception and the autonomic nervous system.

Until some are completed that show accuracy better than a coin flip, I wouldn't be confident that this "test" has anything to do with the autonomic nervous system.

In response to your original question, I know of no documented conditions for which CVSA examiners will refuse to test a person.

Like with polygraphs, the important thing here is that before we start discussing whether or not a particular technology can or cannot detect deception in people with medical conditions, it must first be shown to detect deception reliably in those with no known health issues.

With polygraphy and especially CVSA, this is not the case.