Jurors should not be reflecting on body language when coming to their conclusions, they must base their verdict on evidence put before them, if a reasonable doubt remains then they must bring a not-guilty verdict.

The average Joe on a jury has very little perception of what body language is conveying!

Then I suggest you may be open to being taken for a ride in life, by people who you don't know well enough to be sure of; but may still have to make a decision about, when you've only got your "Savvy" and their body language to go on.