bad news bears a ton of spices are full of lead (consumer reports has some info but it’s partially paywalled) so is that 1984 Garfield mug and most fiber sources and anything brightly colored from before 1978 (4 yrs after women were allowed to get credit cards in their name) and many water bottles with a vacuum sealed interior due to leaded solder or some shit
I suspect it is select plants grown in lead-contaminated soil (not sure why entire ranges are contaminated, maybe most major growing regions are contaminated for certain plants?). Idk how they’d work lead into the chopping/drying process (but I do believe they could if it saved $0.0043/kilogram)
My guess is leftover fallout from leaded gasoline