Adulterated dutch bud is a reality.A large percentage of weed from holland is adulterated with either silica sand or spun sugar and glycerin.It is added to the crop when it is harvested (before drying)to add up to 20% extra weight to the product.If it looks like it is drowning in crystals, better lick a bud to test it.If it is sweet it was sprayed with the sugar/glycerin blend.Not sure about the sand, but I geuss if you rub a bud on glass and it SCRATCHES it then it was cut with sand.
It's not too hard to spot adulterated herb,in a year of running my site, my supplier has only gotten stuck with laced bud once.And it was still plenty potent, just not as potent as it would have been WITHOUT the adulterant.