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Re:“You will not be arrested for using drugs” by tarpherder on Thursday December 04, 2014 @08:48AM (#8699157)
The GGD site has information on how to tell them apart:

"Test it by placing a pinch of the powder on your tongue. If, within a few minutes, this does not have a numbing effect, it is not cocaine. It could be heroin instead."

http://www.ggd.amsterdam.nl/english/drugsalert/more-informat...

Re:“You will not be arrested for using drugs” by apendleton on Thursday December 04, 2014 @11:16AM (#8699958)
This on a government website is even more amazing from an American perspective than the linked flier. Talk about taking harm reduction seriously...