Williams, C.J.
This is a medical disciplinary proceeding wherein petitioner, Washington State Medical Disciplinary Board (board), sought to revoke the medical license of respondent, Dr. James C. Johnston. After an administrative hearing, the board ordered revocation of respondent's medical license. On review, the Thurston County Superior Court upheld the board's ruling. Division Two of the Court of Appeals reversed and remanded for a new administrative hearing on the basis of the appearance of fairness doctrine. State Med. Disciplinary Bd. v. Johnston, 29 Wn. App. 613, 630 P.2d 1354 (1981). For the reasons set forth below, we reverse the Court of Appeals and reinstate the board's revocation of respondent's license to practice medicine.
From 1973 to 1976, respondent conducted a "preventive medicine" practice in Bellevue. Part of his practice consisted of treating various ailments with "natural remedies". The board initiated these medical disciplinary proceedings against respondent for his alleged "gross incompetency" in the treatment of two patients, Robert Hendrickson and Marcella Moore, and for aiding and abetting Remigio Peralta in the unlicensed practice of medicine. The following is a summary of the facts underlying respondent's [469]*469involvement with Hendrickson, Moore, and Peralta:
Robert Hendrickson: Respondent first saw Mr. Hen-drickson in May of 1976 for a urinary problem. In early July of 1976 Hendrickson, complaining of a large blister on his abdomen, again contacted respondent. On July 10,1976, respondent went to Hendrickson's home and found him to be critically ill. Respondent later testified that at this point, he repeatedly suggested hospitalization and diagnostic tests to Mr. Hendrickson, but that Hendrickson refused because of his distrust of hospitals and the medical profession. It was at this point, according to the respondent, that he pursued "natural remedies" as a last resort. The program of treatment prescribed by the respondent included herbal tea enemas, a liquid diet, and periods of fasting.
By August 2, 1976, Mr. Hendrickson had lost a great deal of weight and remained critically ill. Respondent testified that he again recommended hospitalization, but Hendrick-son refused. An abdominal wall abscess developed, which respondent treated by suturing. Respondent testified this abscess was in fact a sterile ulcer. After three more office visits, respondent finally convinced Mr. Hendrickson to seek hospital care. He was admitted to Swedish Hospital in Seattle on August 10, 1976, and was placed in the care of Dr. Robert M. Mack. Dr. Mack's initial diagnosis was that Mr. Hendrickson's abdominal problems were the result of a cancerous growth. The diagnosis was confirmed by laboratory analysis of tissue specimens removed during exploratory surgery.
While in the hospital, Hendrickson developed pneumonia and acute renal failure and his condition continued to deteriorate until, on August 25, 1976, he died. Dr. Mack's final diagnosis noted three contributing causes of death: (1) cancer of the colon; (2) respiratory failure caused by pneumonia; and (3) renal failure resulting from shock.
Marcella Moore: Mrs. Moore, like Mr. Hendrickson, had a strong aversion to traditional medicine, and had a history of inclination toward self-medication. She had been a patient of the respondent since 1974. Respondent visited [470]*470Mrs. Moore on November 3, 1976, at the home of Dave and Carolyn McCormack, with whom Moore was then living. He found her to be seriously ill and preliminarily diagnosed the problem as gallstones lodged in her bile duct. Respondent recommended hospitalization, but Moore refused, preferring a program of "natural remedies1'.
Respondent spent the night caring for Mrs. Moore, his treatments consisting mainly of oral medications and administrations of coffee enemas diluted to the strength of 3 tablespoons of coffee per quart of water. According to respondent, at about 3:30 a.m. on November 4, Moore passed several gallstones in her bowel movements.
The following morning, respondent left Mrs. Moore in the care of Dave McCormack. According to respondent, Mr. McCormack was instructed to give her no more than two coffee enemas that morning and to immediately call him if there were any complications. Mr. McCormack testified that respondent instructed him to have Mrs. Moore eat normally and sleep as much as possible.
Later that afternoon, Moore began to feel much better and insisted on continuing the coffee enemas. They were administered approximately 10 times in the next 10 hours at stronger concentrations than respondent had prescribed. At 7:30 p.m. on November 4, 1976, Mrs. Moore had a seizure. Mr. McCormack phoned respondent, who instructed that the enemas should be discontinued and that he should be instructed of any changes in her condition. Nevertheless, Moore insisted on continuing the coffee enemas and suffered several more seizures, the last coming at approximately 5:45 a.m. on November 5. At this point, McCormack again phoned respondent, who ordered the dispatch of an ambulance.
Mrs. Moore was admitted to Evergreen Memorial Hospital in Everett, where Dr. Paul Sandstrom became her attending physician. She was comatose upon admission and suffered from an extreme electrolyte imbalance. Mrs. Moore died 12 days later. The autopsy report stated the cause of death as "the administration of large volumes of [471]*471fluid by enema." Exhibit 6.
Remigio Peralta: In 1975, respondent employed Remigio Peralta, who worked in Dr. Johnston's laboratory, served as a massage therapist, and assisted in the delivery of babies. Peralta had completed 3% years of medical school at the University of Washington and held a degree in naturopathy from Bernadean University in Las Vegas, Nevada, but was not licensed to practice medicine in Washington. He also had pending an application for a Washington State midwifery license.
In October of 1975, Mr. and Mrs. Kenneth Solheim, who were expecting a child and wanted a home delivery, were referred by a licensed midwife to Dr. Johnston's clinic. They met with Peralta, whom they assumed to be a licensed physician. Peralta examined Mrs. Solheim and told the couple he would deliver their child. Approximately 1 week later, Peralta delivered the child without undue complications, performing such surgical procedures as cutting the child's umbilical cord. Despite never having met the Solheims, respondent signed the child's birth certificate as the attending physician.
The board was created by the Medical Disciplinary Board Act, RCW 18.72. The declaration of purpose of the act is set forth in RCW 18.72.010, as follows:
This chapter is passed:
(1) In the exercise of the police power of the state to protect public health, to promote the welfare of the state, and to provide an adequate public agency to act as a disciplinary body for the members of the medical profession licensed to practice medicine and surgery in this state;
(2) Because the health and well-being of the people of this state are of paramount importance;
(3) Because the conduct of members of the medical profession licensed to practice medicine and surgery in this state plays a vital role in preserving the health and well-being of the people of the state; and
(4) Because the agency which now exists to handle disciplinary proceedings for members of the medical profession licensed to practice medicine and surgery in this state is ineffective and very infrequently employed, and [472]*472consequently there is no effective means of handling such disciplinary proceedings when they are necessary for the protection of the public health.
At the time of the hearing now in issue, the board consisted of seven physicians. Each board member was elected by other licensed physicians in each of the then-existing congressional districts. RCW 18.72.040. The board is empowered to investigate complaints of unprofessional conduct; to conduct hearings on such complaints; and to reprimand, suspend, or revoke the licenses of physicians guilty of such conduct. RCW 18.72.150.
In September of 1976, the board received a letter from Dr. Robert Mack, complaining of respondent's treatment of Mr. Hendrickson. Dr. Mack was Hendrickson's attending physician at the time of his death. Action was commenced on the complaint on or about September 21, 1976. The board had a preliminary investigation conducted by five investigators from the Division of Professional Licensing. The board then instructed Mr. John Keith, the assistant attorney general assigned to it as legal counsel, to draw up a statement of charges against the respondent. At some point prior to the hearings, the chairman of the board, Dr. Richard Diefendorf, initiated a telephone conversation with Dr. Mack in which the two men briefly discussed the complaint.
On December 3, 1976, the board received a complaint from Dr. Sandstrom, Marcella Moore's attending physician at the time of her death, regarding the respondent's treatment of Moore. Dr. Diefendorf, who was ill at the time, contacted the board's cochairman, Dr. Iverson, who on December 7, 1976, issued an order of summary suspension of respondent's medical license. On December 11, 1976, the board ratified the action and set a hearing date of January 15, 1977, to hear the respondent's case.
At a hearing on February 11, 1977, counsel for the respondent questioned the three members of the board then present, and eventually challenged their abilities to [473]*473act impartially in the matter because of their alleged pro-secutorial involvement in the case, the chairman's relationship with Dr. Mack, and the members' possible prejudgment of the case. After consultation between the board's counsel and respondent's counsel, a stipulation was prepared whereby a hearing examiner would preside over the hearing and prepare findings of fact. The full board rejected this proposal and instead determined to hear the matter itself. On April 15, 1977, a hearing was held before the full board. Despite respondent's request for a continuance because his new counsel was unfamiliar with the entire case, the board heard prosecution witnesses against the respondent, and respondent's counsel cross-examined those witnesses. The case was continued to June 17, 1977, for the presentation of respondent's defense. At that time, Dr. Johnston testified on his own behalf. The board entered findings of fact and conclusions of law and on July 6, 1977, ordered that Dr. Johnston's license to practice medicine be revoked.
Respondent petitioned for review in superior court, and in a memorandum opinion the court affirmed the board. Appeal was then taken to the Court of Appeals, Division Two. The Court of Appeals found that there was no violation of the due process clause or of the administrative procedure act, RCW 34.04. The court did hold, however, that the involvement of the same board members as investigators and adjudicators violated the appearance of fairness doctrine. The case was thus reversed and remanded for a new hearing.
Respondent's appeal basically questions the procedures followed by the Disciplinary Board on the basis of violations of the (1) due process clause; (2) Washington administrative procedure act, RCW 34.04; and (3) appearance of fairness doctrine. Additionally, respondent challenges the sufficiency of the evidence relied upon by the board to revoke his license.
[474]*474I
Due Process
Procedural due process imposes constraints on governmental decisions which deprive individuals of "liberty" or "property" interests within the meaning of the due process clauses of the fifth and fourteenth amendments to the United States Constitution. Mathews v. Eldridge, 424 U.S. 319, 332, 47 L. Ed. 2d 18, 96 S. Ct. 893 (1976); Wolff v. McDonnell, 418 U.S. 539, 557-58, 41 L. Ed. 2d 935, 94 S. Ct. 2963 (1974). ”[T]he right to be heard before being condemned to suffer grievous loss of any kind, even though it may not involve the stigma and hardships of a criminal conviction, is a principle basic to our society." Joint Anti-Fascist Refugee Comm. v. McGrath, 341 U.S. 123, 168, 95 L. Ed. 817, 71 S. Ct. 624 (1951) (Frankfurter, J., concurring). A professional license revocation proceeding has been determined to be "quasi-criminal" in nature and, accordingly, entitled to the protections of due process. In re Ruffalo, 390 U.S. 544, 551, 20 L. Ed. 2d 117, 88 S. Ct. 1222 (1968); Schware v. Board of Bar Examiners, 353 U.S. 232, 238-39, 1 L. Ed. 2d 796, 77 S. Ct. 752 (1957); In re Kindschi, 52 Wn.2d 8, 11-12, 319 P.2d 824 (1958). Respondent raises two distinct issues of potential due process violations, each of which will be dealt with separately.
First, he contends that there was an element of prejudgment bias which deprived him of due process. In Ritter v. Board of Comm'rs, 96 Wn.2d 503, 512, 637 P.2d 940 (1981), this court recognized three types of bias which call for disqualification in quasi-judicial proceedings:
"These are [1] prejudgment concerning issues of fact about parties in a particular case; [2] partiality evidencing a personal bias or personal prejudice signifying an attitude for or against a party as distinguished from issues of law or policy; and, [3] . . . an interest whereby one stands to gain or lose by a decision either way." (Footnote omitted.) Buell v. Bremerton, 80 Wn.2d 518, 524, 495 P.2d 1358 (1972); See 3 K. Davis, Administrative Law § 19.1, at 371 (2d ed. 1980).
Respondent recites the following language which, he con[475]*475tends, demonstrates the first two types of bias as recognized in Ritter:
Doctor Diefendorf: ... It was my judgment, I'm speaking for myself, and the others can speak for themselves, that the handling of this case was so unheard of in my opinion and the approach to the handling of the case was so poor, that I thought that if there are other people that might be involved in a similar case, that this was a very dangerous thing and that's what I think now, speaking about myself personally, and I think the rest of the group feels the same way.
Now, to get into the specifics of this thing, if you want to do it, we would naturally want to have all the appropriate witnesses here to prove what we think is correct. It's true that we don't use a summary suspension very often, but when we do, we feel that there is a real grave danger to the public and that's why we did it in this case.
Report of Proceedings, January 15, 1977, at 6.
Not only is a biased decision maker constitutionally unacceptable, but "our system of law has always endeavored to prevent even the probability of unfairness." In re Murchison, 349 U.S. 133, 136, 99 L. Ed. 942, 75 S. Ct. 623 (1955). Where there is merely a general predilection toward a given result which does not prevent the agency members from deciding the particular case fairly, however, there is no deprivation of due process. See FTC v. Cement Inst., 333 U.S. 683, 92 L. Ed. 1010, 68 S. Ct. 793 (1948); Franklin Cy. Sheriff's Office v. Sellers, 97 Wn.2d 317, 333, 646 P.2d 113 (1982). See generally 3 K. Davis, Administrative Law § 19.1, at 371 (2d ed. 1980). It would seem that, given the board's duty to take emergency action to summarily suspend a physician's license if necessary to protect the public, its general predilection toward respondent's case is understandable and defensible. The above language, when read in an isolated context, tends to demonstrate a possible prejudgment bias against respondent and his unorthodox medical practices. When read in light of the board's duties to the public, however, Dr. Diefendorf's comments can be explained as an elaboration on why respondent's license [476]*476had to be suspended summarily for the protection of the public. See RCW 18.72.150(6). We find that no prejudgment bias was demonstrated to exist against respondent in this case.
The second due process contention of the respondent concerns the concentration of investigatory, prosecutory, and adjudicatory functions in one body. Respondent contends the combination of these potentially contradictory functions is, in itself, a violation of due process. The dangers inherent in combining such functions in a single entity have been noted by the United States Supreme Court:
"A genuinely impartial hearing, conducted with critical detachment, is psychologically improbable if not impossible, when the presiding officer has at once the responsibility of appraising the strength of the case and of seeking to make it as strong as possible.
Wong Yang Sung v. McGrath, 339 U.S. 33, 44, 94 L. Ed. 616, 70 S. Ct. 445 (1950). Accord, Huber Pontiac, Inc. v. Allphin, 431 F. Supp. 1168, 1172 (S.D. Ill. 1977), vacated on other grounds sub nom. Huber Pontiac, Inc. v. Whitler, 585 F.2d 817 (7th Cir. 1978). The same concerns were expressed by Justice Brennan, then a New Jersey state judge, when he said the concern with concentration
springs from the fear that the agency official adjudicating upon private rights cannot wholly free himself from the influences toward partiality inherent in his identification with the investigative and prosecuting aspects of the case; in other words, that the atmosphere in which he must make his judgments is not conducive to the critical detachment toward the case expected of the judge. In a sense the combination of functions violates the ancient tenet of Anglo-American justice that "No man shall be a judge in his own cause." . . . "The litigant often feels that, in this combination of functions within a single tribunal or agency, he has lost all opportunity to argue his case to an unbiased official and that he has been deprived of safeguards he has been taught to revere."
(Citations omitted. Italics ours.) In re Larsen, 17 N.J. Super. 564, 574, 86 A.2d 430 (1952) (Brennan, J., concurring).
[477]*477In the present case, the board, Superior Court, and Court of Appeals all relied upon the case of Withrow v. Larkin, 421 U.S. 35, 43 L. Ed. 2d 712, 95 S. Ct. 1456 (1975) as dispositive of the combination of functions issue. In that case, the Supreme Court noted the potential problems with a combination of functions, but went on to state:
The contention that the combination of investigative and adjudicative functions necessarily creates an unconstitutional risk of bias in administrative adjudication has a much more difficult burden of persuasion to carry. It must overcome a presumption of honesty and integrity in those serving as adjudicators; and it must convince that, under a realistic appraisal of psychological tendencies and human weakness, conferring investigative and adjudicative powers on the same individuals poses such a risk of actual bias or prejudgment that the practice must be forbidden if the guarantee of due process is to be adequately implemented.
Withrow, at 47. The concentration of functions in a single agency may be unfortunate and subject to much criticism, but where it has been designed by the Legislature and generally comports with notions of fairness and due process, it is almost uniformly upheld. See Withrow v. Larkin, supra; Kennecott Copper Corp. v. FTC, 467 F.2d 67, 79 (10th Cir. 1972), cert. denied, 416 U.S. 909, 40 L. Ed. 2d 114, 94 S. Ct. 1617 (1974). See generally B. Schwartz, Administrative Law § 111 (1976). We find Withrow to be the controlling authority with regard to the combination of functions issue on federal due process grounds. Therefore, we find no violation of the federal due process clauses.
Respondent contends, however, that Washington is free to provide greater due process protections to its citizens under the Washington Constitution's due process clause, Const. art. 1, § 3.1 We have recently interpreted some provisions of our state constitution more expansively than parallel federal constitutional provisions. See, e.g., State v. [478]*478White, 970 Wn.2d 92, 640 P.2d 1061 (1982) (Const. art. 1, § 7 broader than Fourth Amendment); Alderwood Assocs. v. Washington Envtl. Coun., 96 Wn.2d 230, 635 P.2d 108 (1981) (Const. art. 1, § 5 broader than First Amendment); State v. Fain, 94 Wn.2d 387, 617 P.2d 720 (1980) (Const. art. 1, § 14 broader than Eighth Amendment); Darrin v. Gould, 85 Wn.2d 859, 540 P.2d 882 (1975) (Const. art. 1, § 12 broader than Fourteenth Amendment equal protection clause). Respondent cites State ex rel. Beam v. Fulwiler, 76 Wn.2d 313, 456 P.2d 322 (1969) as establishing such an increased level of protection under the Washington due process clause. While we have interpreted our state constitution to provide greater protections than the federal constitution under some circumstances, and will continue to do so if the need arises, we decline respondent's invitation to do so in this case. Since the appearance of fairness doctrine already provides procedural protections beyond the minimum requirements of the federal due process clauses, see Vache, Appearance of Fairness: Doctrine or Delusion?, 13 Willamette L.J. 479 (1977), we find it unnecessary to expansively read the parallel state constitutional provision.
II
Appearance of Fairness
Under the appearance of fairness doctrine, proceedings before a quasi-judicial tribunal are valid only if a reasonably prudent and disinterested observer would conclude that all parties obtained a fair, impartial, and neutral hearing. Swift v. Island Cy., 87 Wn.2d 348, 361, 552 P.2d 175 (1976). Although this doctrine originated in the land use area, see Smith v. Skagit Cy., 75 Wn.2d 715, 453 P.2d 832 (1969), it has been extended to other types of quasi-judicial administrative proceedings, see Chicago, M., St. P. & Pac. R.R. v. State Human Rights Comm'n, 87 Wn.2d 802, 557 P.2d 307 (1976).
The Court of Appeals in the present case concluded that an appearance of unfairness is created by the same tribunal combining investigative and adjudicative func[479]*479tions. State Med. Disciplinary Bd. v. Johnston, 29 Wn. App. 613, 626, 630 P.2d 1354 (1981). The court cited to the following language from State ex rel. Beam v. Fulwiler, supra at 315-16, in support of its analysis:
Inescapably the commission members became the investigators, the accusers, the prosecutors, mayhaps the witnesses, and if allowed to sit as an appellate tribunal, the judges upon the merits of the charges. Despite the integrity of the respective members of the commission, and their undoubted desire to be objective in their appellate disposition of the matter, it is highly unlikely, under the unusual circumstances prevailing, that the respondent or anyone in a like situation could approach or leave a hearing presided over by a tribunal so composed with any feeling that fairness and impartiality inhered in the procedure.
(Italics ours.) Beam, however, can be read as involving not merely a combination of functions, but also prejudgment bias, since several members of the tribunal had taken a public stance on the case beforehand. It appears the Court of Appeals concern that combining investigative and adjudicative functions in one agency is well founded, since even the United States Supreme Court has characterized the issue as "substantial". Withrow v. Larkin, supra at 51. Nevertheless, we detect no inherent unfairness in the mere combination of investigative and adjudicative functions, without more, that would prompt invocation of the appearance of fairness doctrine. The bare fact that the same administrative adjudicators also are clothed with investigative powers does not mean the case will be decided on an improper basis or that there will arise a prejudgment on the ultimate issues. We must presume the board members acted properly and legally performed their duties until the contrary is shown. Hoquiam v. PERC, 97 Wn.2d 481, 646 P.2d 129 (1982); Rosso v. State Personnel Bd., 68 Wn.2d 16, 20, 411 P.2d 138 (1966). We are convinced the mere combination of adjudicative and investigative powers in one agency, without more, would not be viewed by a reasonably prudent and disinterested observer as denying any party a [480]*480fair, impartial, and neutral hearing.
The opinion of the Court of Appeals also questioned the practice of assigning a single assistant attorney general to serve as both the board's legal advisor and prosecutor, but considered this matter "not . . . dispositive, yet worthy of comment, [and] raising] the specter of unfairness." State Med. Disciplinary Bd. v. Johnston, supra at 626. The court noted that although this dual capacity is authorized by RCW 18.72.040,2 it believed the performance of both roles by the same individual was inherently inconsistent and created the potential for disproportionate influence with the board.
In State ex rel. State Bd. of Med. Examiners v. Clausen, 84 Wash. 279, 284-85, 146 P. 630 (1915), this court examined the meaning of RCW 43.10.067, which pertains to the employment of attorneys other than the Attorney General.3 The court found the state board of medical examiners had no express or implied power to employ private counsel at state expense since the Attorney General was, by statute, made the exclusive legal representative of the board. While Clausen remains the law in this area, we do not read that case to mean RCW 43.10.067 restricts the number of assistant attorneys general that can be assigned to any one agency. When the performance of any legal duties required of the Attorney General presents actual conflicts of interest, a different assistant attorney general can, and should, be assigned to handle those inconsistent functions. The Georgia Court of Appeals in Schaffer v. State Bd. of Veterinary Medicine, 143 Ga. App. 68, 237 S.E.2d 510 (1977) recently [481]*481held the position of a single attorney as both legal advisor and prosecutor was prejudicial when the position actually permitted him to prevail upon the board in its decisions. We find that no actual prejudice has been demonstrated in the present case, but when the dual roles of the Attorney General present such a conflict, two separate attorneys should handle those functions. See also CPR DR 7-110 (prohibiting ex parte communications with the decision maker while the case is pending). In sum, we do not believe under the facts of this case that a reasonably prudent and disinterested observer would be left with the feeling that a fair, impartial, and neutral hearing was denied to any party in this action.
Ill
Washington Administrative Procedure Act
Respondent contends the board violated three provisions of the Washington administrative procedure act, RCW 34.04: (1) RCW 34.04.115, prohibiting ex parte consultations by agency members with parties or witnesses during the proceeding; (2) RCW 34.04.100(2), requiring all evidence used to be offered into evidence on the record; and (3) RCW 34.04.090(7), requiring findings to be based exclusively on the record and on matters officially noticed by the board.
As to the first asserted violation concerning the board's consultation with its investigators and a telephone conversation between Dr. Diefendorf and a witness, Dr. Mack, we find no violation of the statute. The board's actions were entirely in accordance with its investigatory powers, as provided in RCW 18.72.150(2). We must construe RCW 34.04.115 to prohibit ex parte consultations during the pendency of the proceedings — not prior to such hearings — or else the board would be without power to carry out its investigatory functions.
We likewise find no violation of RCW 34.04.100(2), since the board apparently did not consider the reports prepared by the investigators while making its decision. Without [482]*482consideration of those documents in the decisionmaking process, no need arises to place the investigative reports on the record.
The asserted violation of RCW 34.04.090(7) arises from the board's conclusion that the respondent violated "accepted surgical standards" without specifically placing evidence on the record of such standards. Since the board is composed strictly of licensed physicians, RCW 18.72.040, and since RCW 34.04.100(4) permits agencies to utilize the specialized knowledge of their members in evaluating evidence presented to them, we believe it is logical and proper for the State Medical Disciplinary Board to draw its own conclusions as to acceptable surgical standards. As to such specialized matters, we give deference to administrative expertise. See English Bay Enters., Ltd. v. Island Cy., 89 Wn.2d 16, 21, 568 P.2d 783 (1977). Additionally, we note that some testimony on acceptable surgical standards in this area was elicited and placed on the record. We find respondent's contention that the board's conclusions were not based on the evidence to be devoid of merit.
IV
Sufficiency of Evidence
Finally, respondent argues the evidence was insufficient to support the board's factual findings and conclusion that his license to practice medicine should be revoked. The Court of Appeals did not pass on the sufficiency of the evidence because it reversed on the appearance of fairness grounds. We have evaluated the large quantity of evidence before us, and have set out a great deal of that evidence in reciting the facts of this case. We find the evidence was sufficient to support the board's revocation of respondent's medical license.
Our judicial review of this case is limited by the "arbitrary or capricious" standard, as set out in RCW 34.04.130(6)(f). Arbitrary and capricious action has been defined as "willful and unreasoning action, without consideration and in disregard of facts or circumstances." Lillions [483]*483v. Gibbs, 47 Wn.2d 629, 633, 289 P.2d 203 (1955). Action taken after giving respondent ample opportunity to be heard, exercised honestly and upon due consideration, even though it may be believed an erroneous decision has been reached, is not arbitrary or capricious. Washington State Employees Ass'n v. Cleary, 86 Wn.2d 124, 542 P.2d 1249 (1975); Bishop v. Houghton, 69 Wn.2d 786, 420 P.2d 368 (1966).
In the present case, the State Medical Disciplinary Board made its findings after a thorough consideration of all the evidence available to it. We cannot substitute our judgment for that of the board, even if we were to see the evidence differently than the agency. Department of Ecology v. Ballard Elks Lodge 827, 84 Wn.2d 551, 527 P.2d 1121 (1974). Further, we must give due deference to the knowledge and expertise of the board. English Bay Enters., Ltd. v. Island Cy., supra. Accordingly, we find the conclusions of the board fully supported by the record and not arbitrary or capricious.
We reverse the Court of Appeals and reinstate the decision of the trial court which upheld the State Medical Disciplinary Board's revocation of Dr. James C. Johnston's license to practice medicine in the state of Washington.
It is so ordered.
Stafford and Brachtenbach, JJ., concur.