The functional approach [to separation of powers issues] emphasizes the core functions of each branch and asks whether the challenged action threatens the essential attributes of the legislative, executive, or judicial function or functions. Under this approach, there is considerable flexibility in the moving branch, usually Congress acting to make structural or institutional change, if there is little significant risk of impairment of a core function or in the case of such a risk if there is a compelling reason for the action.

To ward off deer, Mr. Haas, an ornithologist, has installed an electric fence around his garden in the park.

Some loony tune parked his car in the no parking section.

He brought four passion fruits from the market.