Purview used in a sentence

Purview in a sentence as a noun

Much of the FDA's purview is protecting these kind of people.

Surely nicotine is a drug and within the purview of the FDA to regulate.

If something went wrong outside their purview, like a tractor breaking down, they informed one of the four farmers, who dealt with it.

He took classified data outside his purview and provided it to folks without access, which seems like pretty clear espionage.

Maybe I'm ignorant or maybe I'm skeptical but I'd always assumed that was their sole purpose: to protect current employer's interests by legally forbidding novel approaches to solving problems within their current purview.