I always sweat especially in my hands. How will this affect a test?
Same here. My hands sweat buckets whenever I'm nervous. Does anyone have any experience with this?
Polygraphers look for changes in perspiration levels (as a function of changes in skin conductivity or resistance) in response to relevant vs. "control" questions. Simply having sweaty hands is not generally taken as an indication of deception. See Chapter 3 of The Lie Behind the Lie Detector (http://antipolygraph.org/lie-behind-the-lie-detector.pdf) for an explanation of polygraph procedure.