This action was commenced on August 12,1986, by the National Treasury Employees Union and an employee of the United States Customs Service seeking declaratory and injunctive relief against implementation of the Customs Service’s “plan to require its current employees to submit to mandatory collection of their urine to screen for the use of illegal drugs as a condition of obtaining promotions and advancement in their careers.” 1 Complaint for Declaratory and Injunctive Relief at 1-2. Under the drug testing program, persons tentatively selected for positions that (1) directly involve drug interdiction, (2) require the carrying of firearms, or (3) involve access to classified information, are required to submit to urinalysis. Pinal selection and placement into one of the covered positions are contingent upon successful completion of drug screening through urinalysis.2
On October 27,1986, plaintiffs moved for a preliminary injunction “suspending Customs’ urine collection and analysis program, pending final disposition of this complaint.” On November 14, 1986, the district court, 649 F.Supp. 380, finding that “numerous constitutional infirmities” plagued the Customs Service’s drug testing program,3 permanently enjoined the program 4 and granted a declaratory judgment that the program was unconstitutional.
On November 21, 1986, the Customs Service filed a notice of appeal of the district court’s judgment and moved in the district court for a stay pending appeal. The dis*1059trict court denied the stay request on December 3, 1986.
The Customs Service has come to this court seeking an expedited appeal and a stay pending appeal; briefing was completed and the motions submitted on December 30, 1986. We granted the Customs Service’s motion for an expedited appeal and have scheduled oral argument for the week of February 2, 1987. For the reasons set forth below, we deny the motion for a stay pending appeal, subject to its reconsideration by the panel hearing oral argument in this case.
In order to obtain a stay pending appeal the moving party must demonstrate: (1) that it is likely to succeed on the merits; (2) that it would suffer irreparable injury if the stay were not granted; (3) that granting the stay would not substantially harm the other parties; and (4) that granting the stay would serve the public interest. See, e.g., United States v. Baylor University Medical Center, 711 F.2d 38, 39 (5th Cir.1983), cert. denied, 469 U.S. 1189, 105 S.Ct. 958, 83 L.Ed.2d 964 (1985). However, this court has not applied these factors in a rigid, mechanical fashion. See Baylor University Medical Center, 711 F.2d at 39. “Indeed, in Ruiz v. Estelle, 650 F.2d 555 (5th Cir.1981), this Court held that the movant ‘need only present a substantial case on the merits when a serious legal question is involved and show that the balance of equities weighs heavily in favor of granting the stay.’ ” Baylor University Medical Center, 711 F.2d at 39 (citing Ruiz, 650 F.2d at 565).
We note first that the legal questions presented by this case are serious questions of substantial import to the Customs Service and its employees and to the citizens of this country. Further, the Customs Service has presented a substantial case on the merits.
Balanced against the facts that serious legal questions are presented by this case and that the Customs Service has presented a substantial case on the merits are the equities. Bearing on the equities are two different considerations. First, as the government states, “[t]his appeal presents questions of first impression for this Court____” Brief for Appellant and Memorandum in Support of Motion for Stay Pending Appeal at i. The government further emphasizes “the unsettled state of the law and the complexity of the constitutional issues presented.” Id. The correctness of the government’s view is amply evidenced by the diverse analyses applied and divergent conclusions drawn by the many courts that have been confronted with the same or similar questions.5
*1060Second, the circumstances that have attended the implementation and subsequent suspension of the Customs Service’s drug testing program, in combination with the imminence of oral argument, militate against the granting of a stay at this particular juncture. The drug testing program was in place for three months before it was enjoined. The program has been stayed by the district court’s order for two months. To prevent the Customs Service from reinstituting its drug testing program for another three weeks is not, in our view, hardship sufficient to warrant our action when plenary consideration of the motion can be afforded by the oral argument panel concurrently with its consideration of the merits of this case. There is, of course, always the possibility that any order that this panel might enter today, based on its conclusions about the factors governing the issuance of a stay, might be superseded by a contrary decision of the oral argument panel. An on-again, off-again approach to the Customs Service’s drug testing program is certainly not in the public’s inter-est, at least not when the lapse of three weeks may eliminate further undesirable turmoil.
We therefore deny the stay, subject to its full reconsideration by the panel hearing the merits of this case.
. The plan was outlined in the "Drug Screening Program” Customs Directive issued on August 4, 1986 with an effective date of August 11, 1986 ("Customs Directive of August 4, 1986”).
. The Customs Directive detailing the drug testing plan states that ”[d]rug screening is required for any change in position, and any competitive staffing action, when such action would result in placement in a position covered by the program.” Customs Directive of August 4, 1986 at 2. Current incumbents of covered positions are not subject to drug testing. A covered position comes under the drug screening program only as it becomes vacant, at which point the tentative selectee is subject to drug screening. Id. Accordingly, both Customs’ employees selected for promotion or placement to a covered position and applicants for a covered position who apply from outside the Customs Service are subject to drug testing.
. The court found, among other things, that the drug testing plan was violative of the fourth amendment, the "penumbral rights of privacy," and of due process.
. The Customs Service was enjoined from conducting urinalysis drug testing in the absence of probable cause. National Treasury Employees Union & Argent Acosta v. Von Rabb, 649 F.Supp. at 391 (E.D.La.1986).
. See, e.g., Shoemaker v. Handel, 795 F.2d 1136 (3d Cir.) (finding that administrative search exception to fourth amendment warrant requirement applied to urine testing by racing commission of plaintiff jockeys in heavily regulated racing industry since the state had strong interest in assuring public of integrity of persons engaged in racing industry and since regulation of the industry had reduced the justifiable privacy expectation of those engaged in it), cert. denied, — U.S. —, 107 S.Ct. 577, 93 L.Ed. 580, (1986); Division 241 Amalgamated Transit Union (AFL-CIO) v. Suscy, 538 F.2d 1264 (7th Cir.) (finding no fourth amendment violation in urine testing of bus drivers who were involved in "serious accidents” or suspected of being under influence of drugs or alcohol because, in view of transit authority’s paramount interest in protecting public by ensuring bus operators’ fitness to perform jobs, plaintiff bus drivers had no reasonable expectation of privacy with respect to submitting to urinalysis and further, because conditions of testing were reasonable), cert. denied, 429 U.S. 1029, 97 S.Ct. 653, 50 L.Ed.2d 632 (1976); American Federation of Government Employees, AFL-CIO v. Weinberger, 651 F.Supp. 726 (S.D.Ga.1986) (determining that in light of fourth amendment considerations, plaintiffs were entitled to injunctive relief against periodic drug testing of civilian employees occupying "critical” positions with Department of Army; "reasonable suspicion" standard applies); Lovvorn v. City of Chattanooga, 647 F.Supp. 875 (E.D.Tenn.1986) (finding that drug testing by urinalysis of all firefighters is violative of fourth amendment because "reasonable suspicion” on which testing could be based could not be said to exist and rejecting city’s suggestion that court carve out exception to reasonable suspicion requirement akin to administrative search exception because clearly defined standards to protect an individual's privacy expectation that exist in administrative search cases were absent in this case); Capua v. City of Plainfield, 643 F.Supp. 1507 (D.N.J.1986) (finding mass urine testing of fire and police department employees unreasonable and thus, violative of fourth *1060amendment because there was high degree of intrusion, no safeguard of confidentiality, plaintiffs had reasonable expectation of privacy, and there was no individualized basis or even general job related basis for instituting mass urinalysis; under fourth amendment, urinalysis can be required only on basis of "reasonable suspicion” which "requires individualized suspicion, specifically directed to the person who is targeted for the search.”); Mack v. United States, No. 86-Civ.-5764 (S.D.N.Y. Apr. 21, 1986) (determining that urinalysis of FBI agent suspected of drug use did not violate fourth amendment because collecting urine is minimally intrusive, this search was not conducted in public view, plaintiff had a diminished privacy expectation as an FBI agent, and FBI has far more compelling interest in having drug-free employees than do other employers because drug involvement of FBI employee jeopardizes national security); Jones v. McKenzie, 628 F.Supp. 1500 (D.D.C.1986) (finding fourth amendment violation in drug testing of plaintiff school bus attendant pursuant to drug testing program initiated as result of increase in traffic accidents and absenteeism and discovery of syringes in restrooms used by transportation employees because there was no probable cause and defendants had no particularized reason to believe plaintiff was a drug user; plaintiff had reasonable expectation of privacy from search which is not, in case of the school bus attendant, outweighed by public safety considerations); McDonell v. Hunter, 612 F.Supp. 1122 (S.D.Iowa 1985) (finding fourth amendment violation in urinalysis drug testing of corrections department employees and concluding that fourth amendment allows government to conduct urinalysis “only on the basis of a reasonable suspicion, based on specific objective facts and reasonable inferences drawn from those facts in light of experience that the employee is then under the influence of alcoholic beverages or controlled substances;” possibility of discovering drug use by employees is too attenuated to make testing constitutionally reasonable); Allen v. City of Marietta, 601 F.Supp. 482 (N.D.Ga.1985) (finding no fourth amendment violation in urinalysis drug testing of “electrical” workers suspected of drug use because although government employees do not surrender their fourth amendment rights by virtue of government employment, government has same right as private employer to oversee its employees and investigate potential misconduct relevant to employee’s performance of duties and therefore, employee cannot claim legitimate expectation of privacy from searches of that nature; here, tests were administered in employment context as part of government’s legitimate inquiry into drug use by employees rather than for law enforcement purposes).