OPINION OF THE COURT
The issue presented by the Unions’ appeal is whether the railroad’s unilateral *1188 addition of a drug-screening component to its employees’ medical examinations gives rise to a “minor” dispute under the Railway Labor Act over which the district court had no subject matter jurisdiction or to a “major” dispute which would entitle the parties to an injunction maintaining the status quo while they bargain over the change. This case concerns only the process pursuant to which drug screening may be introduced; it has nothing to do with whether drug screening is a good idea.
The district court concluded that the parties’ prior practice with respect to medical examinations “arguably justified” the railroad’s unilateral imposition of uniform drug screening and dismissed the Unions’ action for want of jurisdiction. We will reverse.
I. Background
A. Facts
Plaintiffs, the Railway Labor Executives’ Association, whose members head railway labor unions representing all crafts, and eighteen unions representing those crafts (hereinafter “Unions”), and defendant Consolidated Rail Corporation (“Conrail”), a railroad, have stipulated to the essential facts in this case. Since its formation in 1976, Conrail has required all employees to undergo periodic physical examination at intervals varying between one and three years depending on the employee’s age and job classification, and has required an examination upon the return to duty of all employees operating trains and engines who were out of service thirty days or longer and of all other employees out of service ninety days or longer “due to furlough, leave, suspension or similar causes.” App. at 71. These examinations have routinely included urinalysis for blood sugar and albumin.
Conrail employees always have been subject to Rule G or its equivalent, an industry-wide rule, which prohibits the use or possession of “intoxicants, narcotics, amphetamines or hallucinogens” by employees on duty or the use of such substances by employees subject to duty, and which requires employees under medication to be certain that their safe performance of duty is not compromised. This rule has been enforced in the past principally by supervisory observation.
Conrail has routinely used drug screening urinalysis as part of the retum-to-duty medical examination of any employee previously taken out of service because of a drug-related problem, and in both periodic and return-to-duty examinations, when the examining physician suspected drug abuse. In applying Rule G. Conrail “encourag[ed] employees who are suspected of being drug or alcohol abusers to voluntarily agree to undergo blood, urine, or other diagnostic tests.”
See
App. at 70;
cf. Brotherhood of Locomotive Eng’rs v. Burlington Northern R.R. Co.,
In February 1986, the regulations of the Federal Railway Administration on “Control of Alcohol and Drug Use in Railroad Operations” became effective. 49 C.F.R. § 219 (1987). These regulations require post-accident drug screening by urinalysis, breathalizer and/or blood testing for all employees covered by the Hours of Service Act, 45 U.S.C. § 61-64b (1982), i.e., for operating employees. 1 Employees reasonably suspected of being under the influence of a prohibited substance may also be tested if they are involved in an operating rule violation or contribute to an accident. The application of these regulations to covered employees is not at issue on this appeal.
*1189 On February 20,1987, Conrail announced its unilateral decision to include a drug screen as part of the urinalysis in all periodic and return-to-duty examinations, and in any special examinations deemed necessary by the physician after a return from a drug-related absence from duty. The Unions filed suit in district court alleging that Conrail’s action violated Section 6 of the Railway Labor Act, 45 U.S.C. § 156 (1982), and the Fourth Amendment’s prohibition of unreasonable search and seizure and sought to enjoin Conrail from instituting the drug testing.
All parties moved for summary judgment. The district court, based on the facts set forth above, concluded that “Conrail’s decision to expand its use of drug testing is arguably justified under terms of the parties’ long-standing medical policy.” See Railway Labor Executives’ Ass’n v. Conrail, No. 86-2698, slip op. at 3 (E.D.Pa. April 28, 1987). It therefore found the dispute to be a “minor” one and dismissed the counts of the complaint based on the Railway Labor Act. The court also dismissed the Fourth Amendment claim on the ground that Conrail is not a government enterprise. Id. at 3-4. The Unions appeal only the order dismissing the Railway Labor Act counts.
The district court’s conclusion that the drug-testing program constitutes a minor dispute is a legal determination.
Brotherhood of Locomotive Eng’rs v. Burlington Northern R.R. Co.,
B. Major and Minor Disputes
This court has recently had occasion to review the statutory background of the Railway Labor Act in
Railway Labor Executives’ Association v. Pittsburgh & Lake Erie Railroad Co.,
The Railway Labor Act (“RLA”), 45 U.S. C. § 151
et seq.,
was passed in 1926 to facilitate labor peace in the railroad industry, then the backbone of the American transportation system.
See
H.R.Rep. No. 328, 69th Cong., 1st Sess. 1-3 (1926) [hereinafter
1926 House Report
];
Baker v. United Transp. Union,
From the beginning, the Act made a distinction between disputes arising from grievances and the interpretation of a contract (“minor” disputes), on the one hand, and disputes arising from changes in pay rates, work rules and working conditions (“major” disputes), on the other.
See
Railway Labor Act, Pub. L. No. 257, §§ 3, First, 5(a)(b), 6, 44 Stat. 577, 578-82 (1926);
see also Brotherhood of R.R.
*1190
Trainmen v. Chicago R. & I. R.R. Co.,
In contrast, parties to a major dispute have always been required to proceed through a more extensive mediation and conciliation mechanism as specified by sections 5 and 6 of the Act, 45 U.S.C. §§ 155-56;
see 1926 House Report
at 3-5;
Elgin,
The legislative history makes clear that labor’s acquiesence to the RLA’s procedure, including management’s right to introduce changes in “minor” dispute situations, was dependent on the general understanding that “minor” disputes, with their attendant compulsory arbitration, were to be limited to “comparatively minor” problems, “representpng] specific maladjust-ments of a detailed or individual quality,”
Elgin,
The classic explanation of the distinction between major and minor disputes appears in
Elgin.
Major disputes are said to arise “where there is no [collective bargaining] agreement or where it is sought to change the terms of one.... They look to the acquisition of rights for the future, not the assertion of rights claimed to have vested in the past.”
We have adopted the following test to assist in determining whether the dispute is a minor one:
[I]f the disputed action of one of the parties can “arguably” be justified by the existing agreement or, in somewhat different statement, if the contention that the labor contract sanctions the disputed action is not “obviously insubstantial”, the controversy is [a minor dispute] within the exclusive province of the National Railroad Adjustment Board.
*1191
Local 1477 United Transp. Union v. Baker,
In this case, the district court found, and the parties do not dispute, that Rule G and the medical examination policy, although not incorporated in the parties’ written agreement, constitute implied-in-fact contractual terms. Thus, we reach the principal issue: whether Conrail’s imposition of a drug screen was an interpretation of one or both of these agreements thereby constituting it as a minor dispute under 45 U.S.C. § 153, First, (i), which it could institute unilaterally, or whether its attempt to impose such a drug screen was a new term constituting a major dispute under 45 U.S. C. § 152, Seventh, over which it must bargain.
II. Discussion
The Unions argue that the incorporation of a drug-screen test as an element of the urinalysis required in all periodic and re-tum-to-duty physical examinations is a change in the existing rules and working conditions. They argue that the working conditions had not previously encompassed testing employees for drugs without some particularized suspicion or past medical problem and therefore the across-the-board testing is a major dispute within the jurisdiction of the district court. They also argue that the drug-screen represents a new method of enforcing Rule G, which had been enforced primarily by supervisory observation. Such a unilateral change in the method of enforcement, they contend, constitutes a major dispute.
Conrail responds that the addition of drug screening is arguably justified by the parties’ long-standing implied-in-fact agreement authorizing Conrail to test the urine of employees to identify workers who are medically unfit for duty. It claims that the new screening is within its prerogative to modify its medical standards and procedures as a result of advances in medical science and medical technology. Conrail contends that because there was no practice of requiring some medical evidence of drug usage prior to urinalysis as part of its routine medical examination, its new program which adds the drug-screen component to such urinalysis is not a significant departure from past practice.
A.
Three other courts of appeals have considered the same or similar drug-testing issues under the RLA, with varying results and rationales. In a pair of cases, the Ninth Circuit denominated as major disputes the use of drug-detecting dogs,
Brotherhood of Locomotive Engineers v. Burlington Northern Railroad Co.,
The majority’s decision in the
Chemical Testing
Case was based chiefly on the “critical differences between the old method and the new method: the old method of enforcing Rule G was voluntary, and required particularized suspicion; the new method is mandatory, and requires only generalized suspicion.”
Id.
at 1092. It noted that the enforcement method employed in the past — the supervisor’s “observing an employee’s gait, breath, odor, slurred speech, or bloodshot eyes — was
*1192
non-intrusive.”
Id.
It rejected the railroad’s claim that the union, by acquiescing “in Rule G’s enforcement by sensory surveillance can be said to have agreed to allow [the railroad] to implement
any
procedure beyond sensory surveillance so long as the procedure is brought into play by ... an ‘objective triggering event.’ ”
Id.
The court also noted that it had recently held that the Fourth Amendment was violated by Federal Railway Administration regulations which imposed a similar testing program based only on generalized suspicion arising from an accident.
Id.
at 1093 (citing
Railway Labor Executives’ Ass’n v. Burnley,
In the
Dog Search Case,
involving the use of trained dogs to randomly search for drugs, the court again relied on the fact that previous practice under Rule G had always required “a triggering event”, the perception of facts by an official suggesting that a specific employee was under the influence of alcohol or drugs.
Railway Labor Executives Association v. Norfolk & Western Railway Co.,
There were two separate testing issues before the Eighth Circuit in
Brotherhood of Maintenance of Way Employees v. Burlington Northern Railroad Co.,
The court divided on the second issue, the railroad’s institution of a drug screen as part of its periodic and return-to-duty medical exams. Two members of the court tersely reversed the district court’s finding that the medical examination screening presented a major dispute. The majority noted that the union did not deny that the agreement allowed medical testing to identify workers who were unfit for duty, and stated that consequently, “all that is involved in the parties’ dispute is the extent to which the urinalysis component of these examinations may be refined in order to predict safe employee performance.”
Id.
at 1024;
see also International Ass’n of Machinists, District Lodge 19 v. Southern Pacific Transp. Co.,
105 LRRM 2046 (E.D. Cal.1980) [available on WESTLAW,
B.
The absence of any uniformity in interpretation by the other courts reinforces our responsibility to make an independent analysis of the applicable law to the undisputed facts. When a court holds that an existing agreement, explicit or implied, arguably justifies a new practice, the court has determined that it is plausible to believe that there was in fact a meeting of the parties’ minds on the general issue. In this case, we must determine whether the existing agreement arguably admits of an implied term encompassing the new drug screening.
See Chemical Testing Case,
The district court held that the new testing was arguably within the terms of the existing medical examination agreement. We reach a contrary legal conclusion because the undisputed terms of the implied agreement governing medical examinations cannot be plausibly interpreted to justify the new testing program.
Under the stipulation agreed to by the parties, use of a drug screen was included as part of the urinalysis in retum-to-duty physical examinations “when the employee has been previously taken out of service for a drug-related problem, or when, in the judgment of the examining physician, the employee may have been using drugs.” App. at 71. It was included as part of the periodic physical examination only in the latter situation, “when, in the judgment of the examining physician, the employee may have been using drugs.” App. at 71-72.
Conrail argues that because it has been conducting drug-screen urinalysis from time to time since 1976, there is an arguable contractual basis for its imposition of drug screening as part of its routine medical examinations. 3 This argument overlooks what to us is the determinative distinction between the old and new practice: before, drug screening was included only when there was particularized cause and not as part of the routine urinalysis. The fact that the prior agreement encompassed drug screening only in instances where there was cause and limited the routinely administered urinalysis to tests for blood sugar and albumin persuades us to reject Conrail’s argument that the medical testing agreement justifies testing without cause.
If we were to accept Conrail’s argument that its prior medical testing justified the drug screen, it would expand the scope and effect of medical testing beyond that of Rule G, the disciplinary rule aimed specifically at substance abuse. Under Rule G, only employees who are impaired while on the job or on call may be disciplined, whereas an employee whose drug use is detected through the new medical testing program may be fired even though s/he was never found to be impaired while at work or subject to duty.
*1194
Ultimately, Conrail’s argument rests on the premise that testing urine for cannabis metabolites is no different in kind from testing urine for blood sugar. This ignores considerable differences in what is tested for and the consequences thereof. Employee drug testing is a controversial issue throughout the railroad industry and beyond.
See, e.g., Jones v. McKenzie,
The function of bargaining over major disputes is obviously to reach agreement on terms and conditions which have not yet been addressed. Conrail cannot point to any existing agreement between the parties on such crucial matters as the drug test to be used, the methods of confirming positive results, and the confidentiality protections to be employed.
Cf. Shoemaker,
C.
The Unions also argue that the new testing is a change in working conditions in that it represents a change in the method of enforcing Rule G, which is itself a working condition. Conrail denies that its drug testing is designed to enforce Rule G, but argues that even if it were, the implementation of a new procedure to enforce Rule G would be a minor dispute. As we noted before, the only court of appeals to reach the issue of the characterization for RLA purposes of a change in the method of enforcement of Rule G ruled that it raised a major dispute.
See Chemical Testing Case,
III. Conclusion
As we have explained above, Conrail’s addition of drug screening to the urinalysis examination of employees as to whom Conrail has no particularized suspicion of drug use changes the terms and conditions governing the employment relationships. It therefore constitutes a major dispute which Conrail cannot impose unilaterally. In *1195 stead, the RLA requires that the parties must bargain under the prescribed procedure.
In so holding, we do not minimize the serious drug and alcohol problem in the transportation industry. See, e.g., De Rosa, Alcohol Problems in the Railroad Industry, in Substance Abuse, supra, 29, 29 (reporting estimate that some 25 percent of railroad workers drink on duty or while subject to duty); New Regulations to Control Substance Abuse in the Transportation Industry, in id. at 31 (alcohol and drug abuse responsible for 37 deaths, 80 injuries and $34 million in property damage between 1975 and 1985). We also note that the Unions have stated in their brief that they “yield to no one in abhorence [sic] of alcohol or drug use in employment, or in the desire to purge the industry of their adverse effects.” Appellants’ Brief at 4. They will have an opportunity to effectuate this desire at the bargaining table.
The order of the district court dismissing the complaint for lack of subject matter jurisdiction will be reversed and the case remanded for further proceedings consistent with this opinion.
Notes
. The Hours of Service Act applies to any "individual actually engaged in or connected with the movement of any train,” but not to all railroad employees. 45 U.S.C. § 61(b)(2). The Court of Appeals for the Ninth Circuit has recently held the Federal Railway Administration regulations to be unconstitutional under the Fourth Amendment.
See Railway Labor Executives' Ass'n v. Burnley,
. There are four, narrowly-cabined situations in which a district court may have subject-matter jurisdiction in a minor dispute despite non-exhaustion of the arbitration procedures.
Childs v. Pennsylvania Fed. Bhd. of Maintenance of Way Employees,
. In 1984, Conrail issued a new medical standards manual requiring a drug screen tp be carried out in connection with all periodic examination urinalyses. The mandated testing was performed in only one of its four administrative regions, and was discontinued for budgetary reasons after six months. Conrail does not contend that this period of limited uniform testing without the apparent knowledge or agreement of the Unions worked a change in the parties’ general agreement governing medical testing.
See generally Baker
v.
United Transp. Union,
