OK, I've read the book.  I am most comfortable with the pucker, slightly less comfortable with the tounge bight; and most uncomfortable with the idea of changing breathing patterns.  My concern is that changing breathing pattterns while trying to answer a question will not look natural will be detected as a CM.

Can I have an effective CM without trying to adjust my breathing?  If not, what breathing change would you recommend as most undedectable and easiest to do while answering questions?

Bluefaced,

You write:

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Why is that? The Department of Defense Polygraph Institute recognizes 12 different changes in breathing as scorable reactions.

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It is not absolutely necessary to display significant reactions on any one channel of the polygraph instrument in order to pass. Whether countermeasures will be effective without a breathing reaction will depend in part on the size of any reaction(s) to the relevant questions.

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You might consider mental countermeasures; some people find that doing mental arithmetic or thinking exciting thoughts naturally produces an attendant breathing reaction (frequently, "blocking," the 12th DoDPI scorable reaction; see pp. 130-31 of the 2nd ed. of TLBTLD) without them having to consciously think about it.