fwiw, that's actually bullshit - they got a "mythbusters" on it and everything - the reaction is from the urshiol (sp?) in the plant, which can be smeared around by rubbing and scratching after you get it on your skin/clothes/gear - but several days later, after you've washed everything, new breakouts on your body are delayed reactions and that systemic thing that was mentioned.
washing your shit after getting exposed is a wise idea
saw tons of the good shit out at beacon rock today!
leaves of 3? fuck! like, every plant in the world has at least 3 leaves on it!