It is obvious to the subject which are the control questions and which are the relevant questions. I have wondered how one can distinguish between responses that represent deception, and responses that represent apprehension that the machine will falsely indicate deception. Some people react more hotly to stress than others, and are prone to produce false positives. Also, people can be trained reduce the likelihood of actual deception being detected.

It is unusual for it to be documented so quickly with respect to an issue that has the level of interest and emotional involvement as does health care reform. Instances of the financial benefactors of Congresscritters getting their sentiments reflected more or less verbatim in the Congressional Record are not novel.

This is your second notice that the warranty on your annoying telephone scam is about to expire.

IANAL, but it seems to me that the standard of proof for criminal penalties is reasonable doubt, for civil penalties it is preponderance of evidence. That is the distinction that appears to be made.