thats called lacing it has u prolly known and its very easy to know/check, all it is , is he sprinkles the crack on top then seals the back. 1 way to know is if the weed is super expensive and also if theres tiny glistening lights when u put the weed to the light, a way to get rid of it is simply either shake it all off or to just put it in some water and then dry and chk.
Anyway can we keep this to ps3 related stuff instead of weed? if you want open up a weed thread lol