Measuring the substances accurately is a matter of significant concern for safety and legality. Small deviations in weight can mean the difference between a "personal use" charge and a "distribution" charge in many jurisdictions. Because these substances are not regulated, the "gram" someone buys on the street is rarely a true gram of the pure substance. For those interested in the technical side of how these substances are weighed and partitioned, there is a detailed overview of measurement practices available to clarify the terminology.
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