interposition

“Of course I know interposition is invalid,” he admitted.

Such refusals could involve legal maneuvers like interposition, in which a community delays or constrains the enforcement of a law it opposes, or nullification, in which a community explicitly declares a law to be null and void within its borders.

Mack told NPR in 2019 that sheriffs "have the responsibility to interpose – it's the 'doctrine of interposition' – whenever anybody is trying to diminish or violate the individual rights of our counties."

Interposition, he has told attendees, is like playing defense in basketball.

Legal scholars say the movement has no grounding in law, yet it is gaining steam: A study last year by scholars at Texas Christian University and Tulane University on behalf of The Marshall Project found that as many as 1 in 10 of America's 3,000-plus sheriffs believe they have the authority to stand between their constituents and higher government entities, a tactic they call "interposition."