Pet health
Two agencies, and the statute draws the line
Updated
FIFRA defines a pesticide and then excludes anything that is a new animal drug, so a flea and tick product is one or the other and never both. Which one follows from what the article is rather than from which office you approach, and the label carries the marking that tells you.
The line
Pesticide, animal drug, or neither.
The hard leaves
CBD, eye drops, and claims.
What goes wrong
Named failures, with the cause for each.
Written from 7 U.S.C. 136(u), 21 U.S.C. 321(v) and 21 U.S.C. 360b. Every page names its source.