What is due process of law depends on the circumstances.[676] It varies with the subject matter and the necessities of the situation. By due process of law is meant one which, following the forms of law, is appropriate to the case, and just to the parties affected. It must be pursued in the ordinary mode prescribed by law; it must be adapted to the end to be attained; and whenever necessary to the protection of the parties, it must give them an opportunity to be heard respecting the justice of the judgment sought. Any legal proceeding enforced by public authority, whether sanctioned by age or custom or newly devised in the discretion of the legislative power, which regards and preserves these principles of liberty and justice, must be held to be due process of law.[677]
Ancient Usage and Uniformity.—What is due process of law may be ascertained in part by an examination of those settled usages and modes of proceedings existing in the common and statute law of England before the emigration of our ancestors, and shown not to have been unsuited to their civil and political condition by having been acted on by them after the settlement of this country. If it can show the sanction of settled usage both in England and in this country, a process of law which is not otherwise forbidden may be taken to be due process of law. In other words, the antiquity of a procedure is a fact of weight in its behalf. However, it does not follow that a procedure settled in English law at the time of the emigration and brought to this country and practiced by our ancestors is, or remains, an essential element of due process of law. If that were so, the procedure of the first half of the seventeenth century would be fastened upon American jurisprudence like a strait jacket, only to be unloosed by constitutional amendment. Fortunately, the States are not tied down by any provision of the Constitution to the practice and procedure which existed at the common law, but may avail themselves of the wisdom gathered by the experience of the country to make changes deemed to be necessary.[678]
Equality.—If due process is to be secured, the laws must operate alike upon all, and not subject the individual to the arbitrary exercise of governmental power unrestrained by established principles of private rights and distributive justice. Where a litigant has the benefit of a full and fair trial in the State courts, and his rights are measured, not by laws made to affect him individually, but by general provisions of law applicable to all those in like condition, he is not deprived of property without due process of law, even if he can be regarded as deprived of his property by an adverse result.[679]
Due Process and Judicial Process.—Due process of law does not always mean a proceeding in court.[680] Proceedings to raise revenue by levying and collecting taxes are not necessarily judicial, neither are administrative and executive proceedings, yet their validity is not thereby impaired.[681] Moreover, the due process clause has been interpreted as not requiring that the judgment of an expert commission be supplanted by the independent view of judges based on the conflicting testimony, prophecies, and impressions of expert witnesses when judicially reviewing a formula of a State regulatory commission for limiting daily production in an oil field and for proration among the several well owners.[682]
Nor does the Fourteenth Amendment prohibit a State from conferring upon nonjudicial bodies certain functions that may be called judicial, or from delegating to a court powers that are legislative in nature. For example, State statutes vesting in a parole board certain judicial functions,[683] or conferring discretionary power upon administrative boards to grant or withhold permission to carry on a trade,[684] or vesting in a probate court authority to appoint park commissioners and establish park districts[685] are not in conflict with the due process clause and present no federal question. Whether legislative, executive, and judicial powers of a State shall be kept altogether distinct and separate, or whether they should in some particulars be merged is for the determination of the State.[686]
In General.—Jurisdiction may be defined as the power to create legal interests; but if a State attempts to exercise such power with respect to persons or things beyond its borders, its action is in conflict with the Fourteenth Amendment and is void within as well as without its territorial limits. The foundation of jurisdiction is therefore physical power capable of being exerted over persons through in personam actions and over things, generally through actions in rem.[687] In proceedings in personam to determine liability of a defendant, no property having been subjected by such litigation to the control of the Court, jurisdiction over the defendant's person is a condition prerequisite to the rendering of any effective decree.[688] That condition is fulfilled; that is, a State is deemed capable of exerting jurisdiction over an individual if he is physically present within the territory of the State, if he is domiciled in the State although temporarily absent therefrom, or if he has consented to the exercise of jurisdiction over him. In actions in rem, however, a State validly may proceed to settle controversies with regard to rights or claims against property within its borders, notwithstanding that control of the defendant is never obtained. Accordingly, by reason of its inherent authority over titles to land within its territorial confines, a State may proceed through its courts to judgment respecting the ownership of such property, even though it lacks the constitutional competence to reach claimants of title who reside beyond its borders.[689] By the same token, probate[690] and garnishment or foreign attachment[691] proceedings, being in the nature of in rem actions for the disposition of property, may be prosecuted to conclusion without requirement of the presence of all parties in interest.[692]
How Perfected: By Voluntary Appearance or Service of Process.—It is not enough, however, that a State be potentially capable of exercising control over persons and property. Before a State legitimately can exercise such power to alter private interests, its jurisdiction must be perfected by the employment of an appropriate mode of serving process deemed effective to acquaint all parties of the institution of proceedings calculated to affect their rights; for the interest of no one constitutionally may be impaired by a decree resulting from litigation concerning which he was afforded neither notice nor an opportunity to participate.[693] Voluntary appearance, on the other hand, may enable a State not only to obtain jurisdiction over a person who was otherwise beyond the reach of its process; but also, as in the case of a person who was within the scope of its jurisdiction, to dispense with the necessity of personal service. When a party voluntarily appears in a cause and actively conducts his defense, he cannot thereafter claim that he was denied due process merely because he was not served with process when the original action was commenced.[694]
Service of Process in Actions in Personam: Individuals, Resident and Nonresident.—The proposition being well established that no person can be deprived of property rights by a decree in a case in which he neither appeared, nor was served or effectively made a party, it follows, by way of illustration that to subject property of individual citizens of a municipality, by a summary proceeding in equity, to the payment of an unsatisfied judgment against the municipality would be a denial of due process of law.[695] Similarly, in a suit against a local partnership, in which the resident partner was duly served with process and the nonresident partner was served only with notice, a judgment thus obtained is binding upon the firm and the resident partner, but is not a personal judgment against the nonresident and cannot be enforced by execution against his individual property.[696] That the nonresident partner should have been so protected is attributable to the fact the process of a court of one State cannot run into another and summon a party there domiciled to respond to proceedings against him, when neither his person nor his property is within the jurisdiction of the Court rendering the judgment.[697] In the case of a resident, however, absence alone will not defeat the processes of courts in the State of his domicile; for domicile is deemed to be sufficient to keep him within reach of the State courts for purposes of a personal judgment, whether obtained by means of appropriate, substituted service, or by actual personal service on the resident at a point outside the State. Amenability to such suit even during sojourns outside is viewed as an "incident of domicile."[698] However, if the defendant, although technically domiciled therein, has left the State with no intention to return, service by publication; that is, by advertisement in a local newspaper, as compared to a summons left at his last and usual place of abode where his family continued to reside, is inadequate inasmuch as it is not reasonably calculated to give him actual notice of the proceedings and opportunity to be heard.[699]
In the case of nonresident individuals who are domiciled elsewhere, jurisdiction in certain instances may be perfected by requiring such persons, as a condition to entering the State, to designate local agents to accept service of process. Although a State does not have the power to exclude individuals until such formal appointment of an agent has been made,[700] it may, for example, declare that the use of its highways by a nonresident is the equivalent of the appointment of the State Registrar as agent for receipt of process in suits growing out of motor vehicle accidents. However, a statute designating a State official as the proper person to receive service of process in such litigation must, to be valid, contain a provision making it reasonably probable that a notice of such service will be communicated to the person sued. If the statute imposed "either on the plaintiff himself, or upon the official" designated to accept process "or some other, the duty of communicating by mail or otherwise with the defendant" this requirement is met; but if the act exacts no more than service of process on the local agent, it is unconstitutional, notwithstanding that the defendant may have been personally served in his own State. Not having been directed by the statute, such personal service cannot supply constitutional validity to the act or to service under it.[701]