You cant. The whole single/double/triple stack thing is just a marketing ploy.
you can use pillreports.com as a sort of gauge, but you dont really ever know how much MDMA is in the pill.
Lunaxo-
No, actually there is a difference and ive had all 4 kinds of stacks...
This is how you tell the difference...
Single Stacks - usually smaller in size and thickish
Double Stacks - usually flatter but wider in diameter
Triple Stacks - as wide as a double stack but twice as thick as a single stack
Quadruple - usually very wide and thick like bulky the ones i had looked as if they had a wax overlay to make it shiny usually pills are dull and powdery
hope this helps =D
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