CRS Annotated Constitution
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The General Issue: Preemption
In Gibbons v. Ogden,1011 the Court, speaking by Chief Justice Marshall, held that New York legislation that excluded from the navigable waters of that State steam vessels enrolled and licensed under an act of Congress to engage in the coasting trade was in conflict with the federal law and hence void.1012 The result, said the Chief Justice, was required by the supremacy clause, which proclaimed not only that the Constitution itself but statutes enacted pursuant to it and treaties superseded state laws that “interfere with, or are contrary to the laws of Congress . . . . In every such case, the act of Congress, or the treaty, is supreme; and the law of the State, though enacted in the exercise of powers not controverted, must yield to it.”1013
Since the turn of the century, federal legislation, primarily but not exclusively under the commerce clause, has penetrated deeper and deeper into areas once occupied by the regulatory power of the States. One result is that state laws on subjects about which Congress has legislated have been more and more frequently attacked as being incompatible with the acts of Congress and invalid under the supremacy clause.1014
[p.244]“The constitutional principles of preemption, in whatever particular field of law they operate, are designed with a common end in view: to avoid conflicting regulation of conduct by various official bodies which might have some authority over the subject matter.”1015 As Justice Black once explained in a much quoted exposition of the matter: “There is not—and from the very nature of the problem there cannot be—any rigid formula or rule which can be used as a universal pattern to determine the meaning and purpose of every act of Congress. This Court, in considering the validity of state laws in the light of treaties or federal laws touching the same subject, has made use of the following expressions: conflicting; contrary to; occupying the field; repugnance; difference; irreconcilability; inconsistency; violation; curtailment; and interference. But none of these expressions provides an infallible constitutional test or an exclusive constitutional yardstick. In the final analysis, there can be no one crystal clear distinctly marked formula. Our primary function is to determine whether, under the circumstances of this particular case, Pennsylvania’s law stands as an obstacle to the accomplishment and execution of the full purposes and objectives of Congress.”1016
Before setting out in their various forms the standards and canons to which the Court formally adheres, one must still recognize the highly subjective nature of their application. As an astute observer long ago observed, “the use or non–use of particular tests, as well as their content, is influenced more by judicial reaction to the desirability of the state legislation brought into question than by metaphorical sign–language of ‘occupation of the field.’ And it would seem that this is largely unavoidable. The Court, in order to determine an unexpressed congressional intent, has undertaken the task of making the independent judgment of social values that Congress has failed to make. In making this determination, the Court’s evaluation of the desirability of overlapping regulatory schemes or overlapping criminal sanctions cannot but be a substantial factor.”1017
[p.245]Preemption Standards.—Until roughly the New Deal, as recited above, the Supreme Court applied a doctrine of “dual federalism,” under which the Federal Government and the States were separate sovereigns, each preeminent in its own fields but not overlapping. This conception affected preemption cases, with the Court taking the view, largely, that any congressional regulation of a subject effectively preempted the field and ousted the States.1018 Thus, when Congress entered the field of railroad regulation, the result was invalidation of many previously enacted state measures. Even here, however, safety measures tended to survive, and health and safety legislation in other areas were protected from the effects of federal regulatory actions.
In the 1940s, the Court began to develop modern standards for determining when preemption occurred, which are still recited and relied on.1019 All modern cases recite some variation of the basic standards. “[T]he question whether a certain state action is pre–empted by federal law is one of congressional intent. The purpose of Congress is the ultimate touchstone. To discern Congress’ intent we examine the explicit statutory language and the structure and purpose of the statute.”1020 Congress’ intent to supplant state authority in a particular field may be express in the terms of the statute.1021 Since preemption cases, when the statute contains no express provision, theoretically turn on statutory construction, generalizations about them can carry one only so far. Each case must construe a different federal statute with a distinct legislative history. If the statute and the legislative history are silent or unclear, the Supreme Court has developed over time general criteria which[p.246]it purports to utilize in determining the preemptive effect of federal legislation.
“Absent explicit pre–emptive language, we have recognized at least two types of implied pre–emption: field pre–emption, where the scheme of federal regulation is so pervasive as to make reasonable the inference that Congress left no room for the States to supplement it, . . . and conflict pre–emption, where compliance with both federal and state regulations is a physical impossibility, . . . or where state law stands as an obstacle to the accomplishment and execution of the full purposes and objectives of Congress.”1022 “Preemption of state law by federal statute or regulation is not favored ‘in the absence of persuasive reasons—either that the nature of the regulated subject matters permits no other conclusion, or that the Congress has unmistakably so ordained.”1023 However, “[t]he relative importance to the State of its own law is not material when there is a conflict with a valid federal law, for the Framers of our Constitution provided that the federal law must prevail.”1024
In the final conclusion, “the generalities” that may be drawn from the cases do not decide them. Rather, “the fate of state legislation in these cases has not been determined by these generalities but by the weight of the circumstances and the practical and experienced judgment in applying these generalities to the particular instances.”1025
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