According to Wikipedia, the metric system is an internationally agreed decimal system of measurement that was originally based on the mètre des Archives and the kilogramme des Archives introduced by France in 1799. And that brings me to the Sentencing Guidelines.
When it comes to drugs, the Sentencing Guidelines punish offenders using drug quantity as a proxy for culpability. In doing so, the question of “how much” relies upon the metric system instead of the good old English system of customary units (like pounds). We (the drug dealers and I) have been confused ever since.
Who knew an eight ball was 3.5 grams?*
*It is true that this has stimulated the American market for gram scales. But that is only good for the Chicoms who have a monopoly on the business of making these handy hand-held devices.