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!