I'm not saying the "one milligram" number is to be believed. I'm saying they had a large pill, packed with a curious amount of powder, which a handful of people shared.
Sugar cubes are a commonly used substrate.
I could readily imagine someone in the 1960's, somewhere along the supply chain having a quantity of prepared sugar cubes looking dubious after changing hands too many times, and repackaging them one-by-one into capsules (maybe packing more than one cube into a single large capsule), with a pestle and mortar, and topping them off with regular powdered sugar.
I think you're expecting other people to operate with a degree of precision and mistrust, neither of which stacks up against the way people really operate on the ground.
Sugar cubes are a commonly used substrate.
I could readily imagine someone in the 1960's, somewhere along the supply chain having a quantity of prepared sugar cubes looking dubious after changing hands too many times, and repackaging them one-by-one into capsules (maybe packing more than one cube into a single large capsule), with a pestle and mortar, and topping them off with regular powdered sugar.
I think you're expecting other people to operate with a degree of precision and mistrust, neither of which stacks up against the way people really operate on the ground.