delivered the opinion of the Court.
Petitioner, a native of Tunis, Africa, was ordered deported after a hearing pursuant to § 242 (b) of the Immigration and Nationality Act of 1952, 66 Stat. 209, 8 U. S. C. § 1252 (b). It was found that he had been convicted in 1938 of violation of the Marihuana Tax Act, 26 U. S. C. § 2591, and sentenced to imprisonment for one year. Section 241 (a) (11) of the 1952 immigration law1 makes such conviction at any time ground for deportation, and § 241 (d) 2 provides that the deportation provisions of § 241 (a) shall apply even though the facts giving rise to the alien’s deportability occurred prior to the date of enactment of the 1952 Act.
At the hearing before a special inquiry officer of the Immigration and Naturalization Service, petitioner did not dispute the fact of his conviction. He did, however, object to the proceedings on the ground that they violated due process and the Administrative Procedure Act, 60 Stat. 237, 5 U. S. C. § 1001 et seq. The hearing officer overruled these objections. Petitioner also contended that the ex post jacto clause of the Constitution precluded the retroactive application of the 1952 law to his case. This contention too was rejected by the hearing officer. Petitioner and his counsel were advised of their right to apply to the Attorney General for the discretionary relief of suspension of deportation under § 244 (a) (5) of the Act.3 At first they declined to do so, but subsequently *304they moved to reopen the hearing to apply for such relief. The special inquiry officer denied the motion. On appeal, the Board of Immigration Appeals affirmed the order of deportation. Though no formal application for suspension of deportation under § 244 (a) (5) had been filed, the Board considered whether such relief was merited but exercised its discretion against the remission.
Petitioner then brought this action for a writ of habeas corpus, challenging the validity of the deportation order on the grounds, inter alia: (1) that the hearing under § 242 (b) of the Act failed to comply with the requirements of the Administrative Procedure Act in that the special inquiry officer was under the supervision and control of officials in the Immigration Service who performed investigative and prosecuting functions; (2) that § 242 (b) violated the Due Process Clause of the Fifth Amendment because it failed to provide for a fair and impartial hearing; (3) that on the date of petitioner’s arrest the Attorney General made a public statement, which “was bound to have great effect upon the special inquiry officer,” to the effect that petitioner was an undesirable citizen for whose deportation the proceedings were “specially designed,” and, further, that in 1952 the Attorney General “prepared a list of 152 persons [including petitioner] whom he desired to deport”; and (4) that the retroactive application of § 241 (a) (11) was unconstitutional as an ex post facto law.
The Government’s return to the writ alleged that petitioner’s deportation had been conducted in accordance with the Constitution, laws and regulations of the United States. No evidence was introduced by either side save the official Immigration Service record of petitioner’s deportation proceedings. The District Court held the deportation order valid and discharged the writ. 113 F. Supp. 22. The Court of Appeals affirmed. 212 F. 2d 830. Petitioner pursues his four basic objections in this *305Court, certiorari having been granted to resolve issues having a significant bearing on the administration of our immigration laws. 348 U. S. 805.
Applicability of the Administrative Procedure Act.
Petitioner concedes that § 242 (b) of the Immigration Act, authorizing the appointment of a “special inquiry officer” to preside at the deportation proceedings, does not conflict with the Administrative Procedure Act, since § 7 (a) of that Act excepts from its terms officers specially provided for or designated pursuant to other statutes.4 He insists, however, that there are several significant discrepancies between the Acts, and claims that in cases of variance the provisions of the Administrative Procedure Act must govern unless those of the Immigration Act “shall . . . expressly” negate their application. Administrative Procedure Act, § 12. The discrepancies relied on stem from the “separation of functions” provision of § 5 (c) of the Administrative Procedure Act. To the extent here material, this section separates investigative and prosecuting functions from those of adjudication, expressly providing that hearing officers shall not be responsible to or under the supervision of those engaged in investigation and prosecution. The section also prohibits the hearing officer from participating or advising in the decision of a case, or one factually related thereto, in which he has performed investigative or prosecuting functions. Section 242 (b) of the Immigration Act, on the other hand, permits the “special inquiry officer” to take the dual role of prosecutor and hearing officer — presenting evidence and interrogating witnesses — and prohibits him only from hearing cases which he has taken some part in inves*306tigating or prosecuting (other than in the permitted dual capacity). An alternative method is permitted by § 242 (b), however, under which an additional immigration officer presents the evidence while the special inquiry officer presides. See 8 CFR § 242.53. Special inquiry officers are subject to such supervision as the Attorney General prescribes, 66 Stat. 171, 8 U. S. C. § 1101 (b)(4), and at present they are subject to the supervision of district directors of the immigration districts to which they are assigned, as well as higher Service officials, all with enforcement responsibilities of the type proscribed by § 5 (c) of the Administrative Procedure Act.
Under the allegations here made, the single attack of the petitioner pertains to the supervision of the special inquiry officer by the investigative and prosecuting officials of the Immigration Service. The alternative procedure of § 242 (b) was employed in this case, so the presiding officer did not undertake the functions of prosecutor; and there is no allegation that he engaged in investigative or prosecuting functions in this or any factually related case. For the sake of clarity, however, we shall consider all of the differences in the hearing provisions of the two Acts in determining whether the Administrative Procedure Act is to govern.
The applicability of the Administrative Procedure Act to deportation proceedings under the Immigration Act of 1917 was considered by this Court in Wong Yang Sung v. McGrath, 339 U. S. 33 (1950). We there held, contrary to the prevailing interpretation and practice of the Department of Justice, that deportation hearings were subject to the Act. Six months later, Congress provided in the Supplemental Appropriation Act of 1951, 64 Stat. 1048, that proceedings directed toward the exclusion or expulsion of aliens should not be governed by §§ 5, 7 and 8 of the Administrative Procedure Act. The issue here presented is whether the Congress reversed itself in the *3071952 Immigration Act and in effect reinstated the Sung case by making the hearing provisions of the Administrative Procedure Act directly applicable to deportation proceedings. A comparison of the pertinent provisions of the two statutes is perhaps the strongest indication that the Congress had no such intention.
1. Section 242 (b) of the Immigration Act begins by enumerating the functions of the special inquiry officer, that he shall administer oaths, receive evidence, etc. A similar though more extensive and detailed provision appears in § 7 (b) of the Administrative Procedure Act, but of course this section makes no mention of functions stemming from the special inquiry officer’s dual role as prosecutor and judge.
2. Section 242 (b) then directs that a determination of deportability be made only upon the record of a proceeding at which the alien had a reasonable opportunity to be present. A similar direction as to the record appears in § 7 (d) of the Administrative Procedure Act, and as to the party’s personal appearance in § 6 (a).
3. Section 242 (b) then deals with matters peculiar to deportation proceedings, which have no direct analogues in the Administrative Procedure Act: safeguards to be established to protect mentally incompetent aliens; the right of the inquiry officer to proceed if the alien deliberately absents himself; the option to pursue the alternative procedure, described above, in which one official prosecutes and another decides.
4. Next in § 242 (b) is the limitation already noted on the special inquiry officer’s sitting in the same case in which he has also engaged in investigative or prosecuting functions. The more restrictive analogue in § 5 (c) of the Administrative Procedure Act has also been presented.
5. Section 242 (b) then sets forth various requirements which are to be included in regulations governing deportation proceedings before the special inquiry officer. The *308first of these gives the alien the right to reasonable notice of the charges against him and of the time and place at which the proceedings shall be held. A similar requirement appears in § 5 (a) of the Administrative Procedure Act.
6. The second provision which § 242 (b) requires to be included in the regulations is the privilege of the alien to be represented by counsel of his own choosing. Section 6 (a) of the Administrative Procedure Act bestows a similar privilege on any person compelled to appear in person before the agency.
7. The regulations under § 242 (b) must also provide that the alien be given a reasonable opportunity to present and examine evidence and to cross-examine witnesses. The same ground is covered in § 7 (c) of the Administrative Procedure Act.
8. The regulations promulgated under § 242 (b) must require that decisions of deportability be based upon reasonable, substantial and probative evidence. To the same effect is § 7 (c) of the Administrative Procedure Act.
9. Finally, in addition to the requirements of § 242 (b), there is the direction of § 101 (b) (4) of the Immigration Act that the special inquiry officer shall be subject to such supervision as the Attorney General shall prescribe. This covers the same question as the portion of § 5 (c) of the Administrative Procedure Act dealing with the supervision and control of hearing officers.
From the Immigration Act’s detailed coverage of the same subject matter dealt with in the hearing provisions of the Administrative Procedure Act, it is clear that Congress was setting up a specialized administrative procedure applicable to deportation hearings, drawing liberally on the analogous provisions of the Administrative Procedure Act and adapting them to the particular needs of the deportation process. The same legislators, Senator McCarran and Congressman Walter, sponsored both the *309Administrative Procedure Act and the Immigration Act, and the framework of the latter indicates clearly that the Administrative Procedure Act was being used as a model. But it was intended only as a model, and when in this very particularized adaptation there was a departure from the Administrative Procedure Act — based on novel features in the deportation process — surely it was the intention of the Congress to have the deviation apply and not the general model. Were the courts to ignore these provisions and look only to the Administrative Procedure Act, the painstaking efforts detailed above would be completely meaningless. Congress could have accomplished as much simply by stating that there should be a hearing to determine the question of deportability.
Section 242 (b) expressly states: “The procedure [herein prescribed] shall be the sole and exclusive procedure for determining the deportability of an alien under this section.” That this clear and categorical direction was meant to exclude the application of the Administrative Procedure Act is amply demonstrated by the legislative history of the Immigration Act. The original bills included statements to the effect that the § 242 (b) procedures were to be exclusive, “[notwithstanding any other law, including the [Administrative Procedure Act].” S. 3455, 81st Cong., 2d Sess.; S. 716, 82d Cong., 1st Sess.; H. R. 2379, 82d Cong., 1st Sess. The “notwithstanding” clause was dropped in later versions of the Act and did not appear in the bills reported out of committee or in the statute as finally enacted. S. 2055, 82d Cong.; H. R. 5678, 82d Cong.; S. 2550, 82d Cong. The deletion is nowhere explained, but it is possible that the phrase was considered unnecessary — and perhaps inappropriate as a description — as § 242 (b) became more detailed, encompassing in its particularization the greater part of the Administrative Procedure Act’s hearing provisions. In the Senate Report accompanying the revised bill, it is *310stated that § 242 (b) sets up special procedures for deportation proceedings, that these are made exclusive, and that the exemption from the Administrative Procedure Act in the Supplemental Appropriation Act of 1951 is repealed because it is “no longer necessary.” S. Rep. No. 1137, 82d Cong., 2d Sess., p. 28. The House Report is to the same effect, stating that the prescribed deportation proceedings shall be the sole and exclusive procedure, “notwithstanding the provisions of any other law.” H. R. Rep. No. 1365, 82d Cong., 2d Sess., p. 58. Throughout the debates it is made clear that the Administrative Procedure Act does not apply directly, but that its provisions have been specially adapted to meet the needs of the deportation process. See particularly the detailed statement of Senator McCarran, 98 Cong. Rec. 5625-5626, wherein he recognizes a departure from the “dual-examiner provisions” of the Administrative Procedure Act, the very section here in issue.
Exemptions from the terms of the Administrative Procedure Act are not lightly to be presumed in view of the statement in § 12 of the Act that modifications must be express, cf. Shaughnessy v. Pedreiro, 349 U. S. 48. But we cannot ignore the background of the 1952 immigration legislation, its laborious adaptation of the Administrative Procedure Act to the deportation process, the specific points at which deviations from the Administrative Procedure Act were made, the recognition in the legislative history of this adaptive technique and of the particular deviations, and the direction in the statute that the methods therein prescribed shall be the sole and exclusive procedure for deportation proceedings. Unless we are to require the Congress to employ magical passwords in order to effectuate an exemption from the Administrative Procedure Act, we must hold that the present statute expressly supersedes the hearing provisions of that Act.
*311 The Hearing Procedures and Due Process.
As noted above, the only complaint which petitioner can urge concerning the hearing procedures in this case is the objection that the special inquiry officer was subject to the supervision and control of officials in the Immigration Service charged with investigative and prosecuting functions. Petitioner would have us hold that the presence of this relationship so strips the hearing of fairness and impartiality as to make the procedure violative of due process. The contention is without substance when considered against the long-standing practice in deportation proceedings, judicially approved in numerous decisions in the federal courts, and against the special considerations applicable to deportation which the Congress may take into account in exercising its particularly broad discretion in immigration matters.
The Claim of Prejudgment.
Our opinions in the Accardi cases stand for the proposition that the Attorney General cannot, under present regulations, dictate the actions of the Board of Immigration Appeals. Accardi v. Shaughnessy, 347 U. S. 260; Shaughnessy v. Accardi, 349 U. S. 280. Petitioner alleges that his case was prejudged within the meaning of these decisions because on’ the day of his arrest for deportation the Attorney General “announced in a public statement5 both in Washington and in New Orleans that *312[petitioner] was an undesirable citizen and had been guilty of many crimes, and that the proceedings were specially designed to deport petitioner,” and that “such publicity was bound to have great effect upon the special inquiry officer.” He alleged, further, that “the Attorney General some time in 1952 prepared a list of 152 persons whom he desired to deport, and that [his] name was included on this list.”
Considering first the alleged list, it is clear that petitioner has not made out a case of prejudgment. He did not allege that either the inquiry officer or the Board of Immigration Appeals had seen the list, had known of its existence, or had been influenced in their decisions by the inclusion of petitioner’s name thereon. In argument before the Board, petitioner stated through counsel that he had “the feeling — and it’s a feeling that’s based upon *313evidence which we will supply — that the real basis for the denial of suspension here was the fact that Marcello was one of these hundred whom the Attorney General had named . . . .” No evidence of this was forthcoming. As to petitioner’s charges concerning the Attorney General’s “list,”'the record is completely barren.
Nor does petitioner fare better in seeking to base prejudgment on the unfavorable publicity accompanying his arrest. He introduced newspaper clippings into evidence to show the adverse local publicity and alleged that this publicity must have had a “great effect” upon the special inquiry officer. But the record indicates clearly that petitioner’s case could not possibly have been prejudiced in the hearing before the inquiry officer. On the question of petitioner’s deportability, the sole issue decided by him, the hearing officer merely applied the statute to the undisputed facts. Petitioner admitted that he was deportable under the Immigration Act of 1952 if the Act could constitutionally base deportation on his 1938 marihuana conviction. And the hearing officer could be expected in any event to take the law as Congress enacted it. In view of this Court’s decisions on the ex post jacto objection, the only ground of attack, he could do nothing else. Petitioner waived the only issue on which prejudgment was possible when he declined to apply for discretionary relief at the proper time. See 8 CFR § 242.54 (d).
The Board of Immigration Appeals considered the availability of discretionary relief, but as to these officials there was not even an allegation by petitioner that they had known of the unfavorable publicity or had been influenced by it. Indeed, there is every indication that the Board had not prejudged the case, since it considered the question of suspending deportation on the merits although not bound to do so in view of petitioner’s waiver below. The Board denied the requested relief, giving reasons. It is not for us in this proceeding to pass on the *314factors relied on by the Board in reaching its conclusion. It is sufficient to observe that all had basis in the record and that none stemmed from any sort of dictation by the Attorney General.
Finally, we note that, even as to his claim relating to adverse publicity, petitioner introduced no evidence other than the newspaper clippings. Surely on this meager showing the district judge was warranted in finding — as he did — that the special inquiry officer, the only official mentioned in petitioner’s pleadings, was not controlled in his decision by superiors in the Department of Justice. The decision of the district judge cannot be set aside as clearly erroneous. Accordingly, we hold that under our Accardi decisions petitioner has failed to make out a case for a new hearing.
Ex Post Facto.
Petitioner’s last objection stems from the fact that his conviction under the Marihuana Tax Act was not ground for deportation at the time he committed the offense, and that he was not forewarned of all the consequences of his criminal conduct. It is urged that we depart from our recent decisions holding that the prohibition of the ex post facto clause does not apply to deportation, and strike down as unconstitutional the retroactive application of the new grounds for deportation in § 241 (a) (11) of the Immigration and Nationality Act of 1952. We perceive no special reasons, however, for overturning our precedents on this matter, and adhere to our decisions in Galvan v. Press, 347 U. S. 522, and Harisiades v. Shaughnessy, 342 U. S. 580.
Affirmed.
Mr. Justice Harlan took no part in the consideration or decision of this case.66 Stat. 204, 8 U. S. C. § 1251 (a)(11).
66 Stat. 208, 8 U. S. C. § 1251 (d).
66 Stat. 204, 8 U. S. C. § 1254 (a)(5).
Section 7 (a) of the Administrative Procedure Act directs that, in general, administrative hearings shall be held before hearing officers appointed pursuant to § 11 of the Act.
Petitioner introduced clippings appearing in New Orleans newspapers relating to the statement. While the press release of the Attorney General was not put in evidence, it read as follows:
. “Attorney General James P. McGranery announced today that Carlos Marcello of Miami, Florida, and Jefferson Parish, Louisiana, has been arrested on a deportation warrant by the Immigration and Naturalization Service.
“The arrest in New Orleans was the first major deportation move undertaken since the new Immigration and Nationality Act became *312effective December 24, 1952. The action was another step in the Attorney General’s program of denaturalization and/or deportation of undesirable persons of foreign birth who are engaged in racketeering or other criminal activities.
“Marcello, born February 6, 1910, in Tunis, Africa, entered the United States for permanent residence October 7, 1910, at New Orleans.
• “He allegedly is engaged in large-scale slot machine operations and other gambling activities in Louisiana.
“The deportation warrant was based on his conviction in 1938 for violation of the Marijuana Act. Such a conviction is a deportable offense under the new Immigration and Nationality Act.
“The action follows lengthy investigations by both the Federal Bureau of Investigation and the Immigration and Naturalization Service. His conviction under the Marijuana Act was one of only two in his checkered career. The other case in which he was convicted was under Louisiana State law, the conviction being for assault and robbery, and on May 13, 1930, he was sentenced to serve a term of 9 to 14 years in the Louisiana State Penitentiary. The Governor of Louisiana gave him a full pardon for this crime July 16, 1935.
“Marcello served a year and a day after his conviction under the Marijuana Act."