Opinion for the Court filed by Circuit Judge DAVIS.
Sanders, et al. (Sanders) appeal the grant of summary judgment to Washington Metropolitan Area Transit Authority (WMA-TA). The District Court (Penn, J.) held that WMATA was immune from this suit. We affirm, partially on other grounds.
I.
In 1982 appellee WMATA promulgated rules requiring that employees who were involved in on-the-job accidents or unusual operating incidents be escorted by a supervisor to a designated medical facility to be tested for the presence of alcohol, illicit drugs, and controlled substances. Blood samples were taken to detect the presence of alcohol. Two urine tests were performed to test for illicit or controlled drugs: an EMIT test (enzyme immunoassay) and a GCMS test (gas chromatography-mass spectrometry). 1
The eighteen appellants were bus or rail operator employees of WMATA, all members- of the union (Local 689). All had been involved in on-the-job incidents and had submitted to the required blood and urine testing. Each was terminated from employment based on positive results of the post-incident medical examinations. Fourteen of the appellants filed grievances under the collective bargaining agreement *1153 challenging their termination. 2 Eleven of them settled prior to final arbitration and were reinstated with back pay; three proceeded to full arbitration, two of whom were reinstated and granted partial back pay; one’s grievance was wholly denied by the arbitrator and he was not reinstated. Four appellants failed to file grievances or pursue their remedies under the collective bargaining agreement. One of those four was a probationary employee and therefore not eligible to file under the collective bargaining agreement. 3
Appellants brought suit in the District Court claiming that they had been negligently discharged from their employment, and also alleging violation of the Fourth and Fourteenth Amendments, deprivation of their right to privacy, and violation of the Rehabilitation Act of 1973, 4 as well as violation of 42 U.S.C. § 1983. 5 They requested compensatory damages, over and above the back pay granted in the grievance proceedings, in the amount of $500,-000 each for injury arising from humiliation, embarrassment, lost wages, and damage to reputation.
WMATA moved for summary judgment, which the District Court granted,
II.
The parties dispute as to what is before us on this appeal. Appellants argue that their constitutional and § 1983 points — that WMATA’s rule on testing is invalid under the Fourth and Fourteenth Amendments because WMATA requires such testing without specific and objective facts giving reasonable suspicion or probable cause to test the particular employee — have been preserved, as well as the separate claims for negligent termination (because the tests were improperly conducted). WMA-TA counters that appellants have now abandoned their constitutional and statutory points (which were undoubtedly raised below) and that the negligent termination claims are precluded by the results of, or failure to follow, the grievance procedure.
It is true that appellants have not argued the merits of their constitutional and § 1983 claims, but we think they have barely maintained their contentions in their brief (App.Br. 4, 14) when they say that they do not challenge WMATA’s right “to conduct post-incident drug testing of employees suspected of drug or alcohol use ” and testing of employees “suspected, on the basis of specific and objective facts, of drug or alcohol use” (emphasis added). We view this somewhat cryptic observation as sufficient to call upon us to reject WMA-TA’s argument that the appellants’ constitutional and § 1983 claims have been abandoned. 6 Appellants’ contention seems to be that testing could not be conducted unless there was sufficient reasonable suspicion or probable cause relating to the individual employee.
Because these claims are still in the case, we must consider the correctness of the *1154 District Court’s holding that WMATA is immune from suit under the Compact on those contentions. 7 To that problem we now turn.
III.
WMATA was established by an interstate compact (Compact) entered into by Maryland, Virginia and the District of Columbia, which was consented to by Congress. Pub.L. No. 89-774, 80 Stat. 1324 (1966), as amended. 8 Section 80 of the Compact provides (D.C.Code.Ann. § 1-2431 (1981)):
The Authority [WMATA] shall be liable for its contracts and for its torts and those of its Directors, officers, employees and agent committed in the conduct of any proprietary function, in accordance with the law of the applicable signatory (including rules on conflict of laws), but shall not be liable for any torts occurring in the performance of a governmental function.
The District Court ruled that, if any tort was committed through the application to appellants of WMATA’s drug-test rule, that injury “occurred in the performance of a governmental function.”
In
Morris v. WMATA,
The federal concept of a “governmental function” in connection with tort liability was defined authoritatively, prior to adoption of the Compact, in the leading case of
Dalehite v. United States,
When the Court came to define the limits of this governmental discretion, the opinion said that it “includes more than the initiation of programs and activities. It also includes determinations made by executives or administrators in establishing plans, specifications, or schedules of operations [footnote omitted]. Where there is room for policy judgment and decision there is discretion.”
Id.
at 35-36,
Varig Airlines,
itself, says flatly that “[t]he discretionary function exception, embodied in the second clause of § 2680(a), marks the boundary between Congress’
*1155
willingness to impose tort liability upon the United States and its desire to protect certain governmental activities from exposure to suit by private individuals."
In granting immunity from tort actions to WMATA's "governmental" functions, the Compact seems to us to have accepted the Dalehite conception which we have just outlined.
9
In construing the Federal Tort Claims Act-the federal consent-to-suit on tort claims-Dalehite had, given the definitive understanding of those torts as to which Congress had consented (in that Act) to actions against the Federal Government. The "governmental function" language of the Compact's Section 80 likewise concerns torts, and torts alone. The parallel is apparent, and it is especially appropriate to follow the Congressional understanding, in tort cases, of "governmental function." First, "Congress played a particularly active role in creating WMA-TA," initiated the Compact, and "expressly retain[ed] WMATA's immunity from suit for `torts occurring in the performance of a governmental function.'" Morris v. WMA-TA, supra,
The core of the Dalehite idea is that WMATA should be immune-in the words of Varig Airlines-from judicial "second-guessing" via tort suits "of legislative and administrative decisions grounded in social, economic, and political policy" (
Iv.
In this case the "governmental function" under the Dalehite-Varig principles was the adoption of the general policy
*1156
of testing for drugs or alcohol immediately after an on-the-job accident or unusual operating incident. That rule was certainly grounded in the social, political, and regulatory activities of WMATA. For one thing it was founded on the social and regulatory policy of protecting the public, WMATA’s employees, and the users of the WMATA transportation systems from danger. Sections 12(c) and 77 of the Compact expressly gave the Authority the right and duty to make regulations for the safety of the public and its employees. In addition, Section 75 of the Compact directed WMATA to comply with the rules of the “signatories and political subdivisions and agencies thereof” with respect to use of streets, highways, vehicular facilities, and traffic control and regulation; the District of Columbia, Maryland and Virginia all prohibit the operation of vehicles by persons who are intoxicated or drugged. Another “governmental” objective sought by the testing policy was the operation of “improved transit facilities,” mandated by Section 2 of the Compact. Ensuring that all WMATA bus and rail operators are competent to drive, free from drugs or alcohol, is obviously a significant regulatory policy tending toward the goal of “improved transit facilities” — a directive plainly including safety considerations.
See Division 241, Amalgamated Transit Union v. Suscy,
It necessarily follows that WMATA is immune from suit on all of appellants’ constitutional and § 1983 grounds (Counts I, III, IV of the complaint). These are all general attacks on the testing plan itself, not on the manner of testing in a particular case. These challenges to the testing plan all invoke judicial “second-guessing,” through a tort suit, of “administrative [WMATA] decisions grounded in social, economic, and political policy” — and therefore invoke “governmental” and “regulatory” functions.
United States v. Varig Airlines, supra,
V.
The remaining count of the complaint (Count VI) — titled “Negligent Termination” —alleges that WMATA negligently implemented the over-all testing plan by failing to use due care in administering and confirming the tests. This assertion is probably not directed to a “governmental” function because there is no indication in the record that the subordinate employees were directed to be negligent or that they were told specifically how to administer the tests. Nor does any real discretion on the part of the testers seem to have been involved. We assume, therefore, that WMA-TA is not immune from suit under this claim of “negligent termination” which appears to be one of ordinary negligence.
There are, however, other bars revealed by the record. 12 Fourteen of the appellants pursued their grievance remedies and either received relief or (in the case of one appellant) were held not entitled to any relief. On the issue of negligent termination, these appellants are es-topped from litigation by the doctrines of claim preclusion (res judicata) and issue preclusion (collateral estoppel) because the issue of negligent termination was either raised or should have been raised in the grievance process, and therefore cannot be pressed again.
For WMATA employees, including appellants, the claim for “negligent termination” was required to be submitted, if unsettled, to final and binding arbitration. Section 66(c) of the Compact explicitly so declares as to all unresolved “labor disputes” and Congress intended to impose such compulsory arbitration. S.Rep. No. 92-931, 92d Cong., 2d Sess. 9 (1972); H.R.
*1157
Rep. No. 92-1155, 92d Cong., 2d Sess. (1972). This court has given the term “labor dispute” in the Compact a broad coverage.
Office & Professional Employees Int’l Union v. WMATA,
A decision in arbitration is normally conclusive in determining an employee’s rights under a collective bargaining agreement.
Steelworkers’ Trilogy (United Steelworkers of Am. v. Enterprise Wheel & Car Corp.,
An aggrieved employee is not always barred from a judicial forum but, as this court stated in
Office & Prof. Emp. Int’l Union v. WMATA,
For reasons of judicial economy as well as the policies of federal law, courts tend to look askance at efforts to seek relief beyond that granted in arbitration proceedings. The rules of res judicata and collateral estoppel must govern our review of such proceedings if we are to advance the goal of promoting arbitration as an alternative to the complications and costs of litigation. Because arbitration is to be encouraged, courts appropriately uphold awards and preclude additional claims that were or should have been submitted to arbitration.
Schattner also made the same ruling for “claims that should have been submitted to arbitration, even if they were not actually heard.” Id. at 1368 (emphasis in original).
There is no claim that the grievance process was unfair or flawed. The result must be that the fourteen appellants who filed grievances have had their “negligent termination” claims decided already, and those decisions preclude renewed and repeated litigation in the current case. Moreover, eleven of these appellants each executed a settlement agreement declaring that “the parties have reached a mutually satisfactory resolution” of that appellant’s grievance. These settlement agreements *1158 further support preclusion of the current claims of the employees who signed them.
Four of the appellants never pursued the grievance process at all. We have already discussed in this Part,
supra,
the requirement of the Compact — supported by the clear intent of Congress — that all “labor disputes” be resolved through the grievance process, including compulsory arbitration (if necessary). Thus, under settled law the WMATA employees who failed to exhaust the grievance and arbitration proceedings, available to them, may not seek redress in court on claims that could and should have been grieved.
Republic Steel Corp. v. Maddox,
One of the four who did not invoke the grievance process was a probationary employee (with less than 90-days service) and under the bargaining agreement he did not have access to grievance proceedings. But, as in the federal civil service system, WMATA was permitted, under the collective bargaining agreement, to discharge him (as a probationer) “at its own discretion”; no “sufficient cause” for termination was required. Accordingly, that probationary employee has no judicial claim for “negligent termination.”
For these reasons, the judgment of the District Court is
Affirmed.
Notes
. Local 689 of the Amalgamated Union (Local 689), on behalf of the WMATA bus and train operations it represented, filed a grievance (under its collective bargaining agreement) protesting the establishment of the rule. The grievance was arbitrated (as required by the agreement if a dispute cannot be settled) and was denied.
. As we have indicated, the collective 'bargaining agreement between the union and WMATA requires WMATA to submit all unresolved labor disputes between WMATA and union employees to final and binding arbitration. See Part V, infra.
. Under the terms of the collective bargaining agreement, WMATA may discharge new employees during a probationary period of ninety days, and no grievance can be claimed by the union. See Part V, infra.
. 29 U.S.C. § 701 et seq.
. 42 U.S.C. § 1983 provides in pertinent part:
Every person who, under color of any statute, ordinance, regulation, custom, or usage of any State ... subjects, or causes to be subjected, any citizen of the United States or other person within the jurisdiction thereof to the deprivation of any rights, privileges, or immunities secured by the Constitution and law, shall be liable to the party injured in an action at law, suit in equity, or other proper proceeding for redress.
.Appellants make no mention of their claims under §§ 503 and 504 of the Rehabilitation Act of 1973, which the District Court rejected; we hold therefore that those claims have been abandoned.
. We do not consider whether those appellants who pursued the grievance procedure or settled under it — and were reinstated and received back pay — are precluded from bringing this suit simply because they received relief in the grievance arbitration process.
Cf. Alexander
v.
Gardner-Denver Co.,
. The Compact is codified at District of Columbia Code sections 1-2431 — 1-2436.
. We recognize that the Dalehite-Federal Tort Claims Act test and the "governmental-proprietary" test are viewed as distinct and not necessarily coterminous (Restatement (Second) of Torts § 895C comments e and g; Prosser and Keaton on Torts 1953 (5th ed. 1983); Spencer v. General Hospital,
. The ,legislative history of the Compact sheds no light on the meaning and scope of "governmental function."
. In Owen v. City of Independence,
. These issues were not reached by the District Court but they were raised below and the record is sufficient for us to resolve them.
See, e.g., Tymshare, Inc.
v.
Covell,
