OPINION
delivered the opinion of the Court,
The plaintiffs, survivors of a tenant killed by the criminal act of another tenant, filed suit against the defendant housing authority. The plaintiffs alleged the housing authority was negligent in failing to evict the other tenant at the first instance of violent behavior. The housing authority filed a motion for summary judgment claiming federal regulations preempted the plaintiffs’ negligence clаim and that it was immune from suit under the Tennessee Governmental Tort Liability Act (“the GTLA”). The trial court denied summary judgment. The Court of Appeals reversed the trial court. We granted review to determine whether the plaintiffs’ negligence claim is preempted *503 by federal law or, in the alternative, whether the housing authority is immune from suit under the discretionary function exception of the GTLA. We conclude that the plaintiffs’ negligence suit is not preempted by federal law. We further conclude that the housing authority’s failure to evict is an operational decision and that the housing authority is not entitled to immunity under the GTLA. We reverse the Court of Appeals and remand this case to the trial court for further proceedings.
I. Facts and Procedural History
On February 26, 2003, Cheryl Brown Giggers, Charles C. Brown, Jr., Angela G. Brown, and Joann Fisher (“the plaintiffs”) filed a complaint against the City of Memphis (“the City”) and Memphis Housing Authority (“MHA”) for the wrongful death of Charles Cornelius Brown, Sr. (“the decedent”). The decedent, a resident of a housing project operated by MHA, was killed by a stray bullet on March 7, 2002, when fellow tenant, L.C. Miller, fired a gun in the direction of the housing project’s security office.
The plaintiffs alleged in thеir complaint that the City and MHA were negligent in failing to properly investigate Mr. Miller’s criminal background and in failing to assess the risk that Mr. Miller posed to other tenants of the housing project. The plaintiffs also alleged that the City and MHA breached the decedent’s lease agreement by failing to safely maintain the housing project.
The trial court granted the City’s motion to dismiss and the plaintiffs amended their complaint, naming MHA as the sole defendant. After receiving MHA’s answer alleging comparative fault, the plaintiffs again amended their complaint to add MHA’s contracted security company, Scruggs Se~ curity and Patrol, LLC (“Scruggs”), as a defendant. The plaintiffs alleged that Scruggs failed to properly secure the housing project at the time of the shooting.
MHA filed a motion for summary judgment asserting that MHA owed no duty to the plaintiffs or to the decedent with respect to Mr. Miller’s criminal actions. The trial court agreed and granted MHA’s summary judgment motion. The Court of Appeals affirmed the trial court.
Giggers v. Memphis Hous. Auth.,
No. W2006-00304-COA-R3-CV,
On remand, MHA moved to dismiss the plaintiffs’ amended complaint because the plaintiffs had not alleged that MHA had a duty to evict Mr. Miller. The trial court denied MHA’s motion and permitted the plaintiffs to amend their complaint a third time. See Tеnn. R. Civ. P. 15.01. In the third amended complaint, the plaintiffs alleged that MHA breached the duty of care owed to the decedent by failing to evict Mr. Miller following an aggravated assault against another tenant in the same MHA housing project in 1998. The plaintiffs also alleged that MHA had a “one-strike” policy in place during 1998 that should have resulted in Mr. Miller’s eviction after the aggravated аssault. 1 Although MHA did not evict Mr. Miller, it placed Mr. Miller on probation for one year following the 1998 incident. Mr. Miller was not involved in any other altercations during the probationary period.
*504 In response to the plaintiffs’ amended complaint, MHA filed a motion for summary judgment on the grounds that the plaintiffs’ negligence claim was preempted by federal law or, in the alternative, that MHA was immune from suit pursuant to the discretionary function exception to the Tennessee Governmental Tort Liability Act (“the GTLA”). Tenn.Code Ann. § 29-20-205(1) (2000). The trial court denied summary judgment. 2 The trial court, however, permitted MHA to file an application for interlocutory appeal pursuant to Rule 9 of the Tennessee Rules of Appellate Procedure because it found “merit to [MHA’s] arguments.”
The Court of Appeals granted MHA’s application for interlocutory appeal and reversed the trial court’s denial of summary judgment. The Court of Appeals held that summary judgment in favor of MHA was appropriate because federal law preempted the plaintiffs’ claim and because MHA was immune from suit under the GTLA.
Giggers v. Memphis Hous. Auth.,
No. W2010-00806-COA-R9-CV,
II. Analysis
At issue in this case is whether the Court of Appeals erred in holding that federal law preempted the plaintiffs’ claim and that MHA was immune from suit pursuant to the GTLA. By remanding the case to the trial court, the Court of Appeals effectively granted summary judgment to MHA. The resolution of a motion for summary judgment is a question of law, which we review de novo.
Martin v. Norfolk S. Ry.,
A. Federal Preemption
The Supremacy Clause of the United States Constitution mandates that federal law preempt contrary state law.
See
U.S. Const. art. VI, cl. 2. The United States Supreme Court has held that state law may not frustrate or stand as an obstacle to the legislative purpose of a federal statute.
Geier v. Am. Honda Motor Co.,
There is no express federal legislation barring negligence suits against public housing authorities. MHA contends, however, that permitting the plaintiffs to proceed with their negligence claim would pose an obstacle to the accomplishment of the full purposes and objectives of Congress in enacting 42 U.S.C. § 1437d (1994).
3
The question of whether a state
*505
law action is preempted by federal law is reviewed de novo as a question of law.
Leggett,
To determine the purpose of § 1437d we first examine the language of the statute.
Am. Tobacco Co. v. Patterson,
Thе United States Supreme Court frequently refers to the stated purpose of legislation to interpret language in the operative sections.
See United States v. Turkette,
We next consider whether permitting the plaintiffs’ negligence claim to proceed would stand as an obstacle to the congressional purpose of promoting safe
*506
public housing. The United States Supreme Court has noted that courts should not assume that Congress intends to supersede state lаw.
N.Y. State Conference of Blue Cross & Blue Shield Plans v. Travelers Ins. Co.,
In determining whether the plaintiffs’ negligence claim would stand as an obstacle to the stated purpose of the United States Housing Aсt of 1937, we also consider the federal housing regulations that implement 42 U.S.C. § 1437d. The Department of Housing and Urban Development (“HUD”) is the agency empowered to administer the federal statute and to promulgate regulations interpreting 42 U.S.C. § 1437d.
See
42 U.S.C. § 3535(d) (1996);
see also King v. Hous. Auth. of Huntsville,
HUD regulations supplement the language of 42 U.S.C. § 1437d.
See Rucker,
*507 Rather than standing as an obstacle to promoting safe public housing, permitting the plaintiffs’ negligence claim complements the purpose of § 1437d. The purpose of the United States Housing Act of 1937 and its 1988 amendment is to promote safe public housing fоr PHA tenants. Section 1437d puts tenants on notice that activity that threatens another tenant’s health or safety may result in termination of the tenant’s lease. HUD regulations provide public housing authorities with the discretion to evict tenants to promote public housing that is safe and free from crime. See 24 C.F.R. § 966.4(1). Mowing the plaintiffs’ negligence claim to proceed does not restrict MHA’s exercise of discretion or obstruct the purpose of § 1437d or its corresponding regulations. Instead, allowing the negligence claim to stand promotes safe public housing for tenants by providing a remedy when a public housing authority exercises its federally vested discretion in a negligent manner. The plaintiffs’ claim will impose liability on MHA only if the trial court determines that under the facts in this case MHA was negligent in failing to evict Mr. Miller in 1998. We hold that the plaintiffs’ negligence suit is not preempted by 42 U.S.C. § 1437d.
B. Sovereign Immunity
Generally, the GTLA forecloses suits against governmental entities that cause injury when exercising or discharging their duties. Tenn.Code Ann. § 29-20-201(a) (2000). An exception to this rule permits a suit against a governmental entity when an employee of that entity acting within the scope of his employment negligently causes injury to another. Tenn. Code Ann. § 29-20-205. A governmental entity remains immune from suit, however, if the injury results from a discretionary act of the governmental entity regardless of whether that discretion was abused. TenmCode Ann. § 29-20-205(1);
see also Limbaugh v. Coffee Med. Ctr.,
To determine whether a governmental entity is entitled to immunity for a discretionary decision, this Court applies the “planning-operational test.”
Bowers v. City of Chattanooga,
In
Bowers,
we determined that a planning decision usually involves сonsideration and debate regarding a particular course of action by those charged with formulating plans or policies.
Bowers,
Operational decisions, however, implement “preexisting laws, regulations, policies, or standards” that are designed to guide the actions of the governmental entity.
Bowers,
Turning to the facts in this case, HUD is the authority charged with the creation of policies and procedures to promote safe public housing. Although HUD’s formulation of policy or procedure may be considered a discrеtionary function, the implementation of that policy is an operational decision.
See Bowers,
MHA uses its judgment when determining whether eviction of a tenant is appropriate.
See
24 C.F.R. § 966.4(0(5). The discretion used to exercise that judgment, however, does not convert an otherwise operational decision into one that is discretionary.
See Bowers,
The parties have debated the existence of a “one-strike” policy that would have required MHA to evict Mr. Miller in 1998 following his aggravated assault against another tenant. We observe that the existence of MHA’s “one-strike” policy is not controlling in our analysis. Even assuming that MHA discussed and established a policy requiring the eviction of
■&
tenant after the first instаnce of disruptive behavior, MHA did not follow that policy in Mr. Miller’s case. When a negligent act occurs in contravention of an established policy, that act is operational in nature and is not entitled to immunity under the GTLA.
Chase v. City of Memphis,
III. Conclusion
We conclude that 42 U.S.C. § 1437d does not preempt the plaintiffs’ suit against MHA. We further conclude that MHA’s decision not to evict Mr. Miller was an operational decision and is not entitled to discretionary function immunity under the GTLA. We reverse the Court of Appeals and remand this case to the trial court for proceedings consistent with this opinion. Costs of this appеal are taxed to the appellee, Memphis Housing Authority, for which execution may issue, if necessary.
Notes
. In construing the facts in a light most favorable to the plaintiffs, this Court acknowledged MHA's "one-strike” policy in
Giggers I,
. The trial court did not include the legal grounds for its denial of summary judgment as required by Tennessee Rule of Civil Procedure 56.04.
. The 1994 version of 42 U.S.C. § 1437d and the corresponding 1996 regulations govern this case because the plaintiffs’ claim arises out MHA's failure to evict Mr. Miller after an *505 altercation in 1998. The 1994 statute and 1996 regulations also control the lease executed by Mr. Miller and MHA in 1996.
. In 1998, 42 U.S.C. § 1437d(l)(5) was redes-ignated as 42 U.S.C. § 1437d(l)(6). Pub.L. No. 105-276 § 512, 112 Stat. 2461 (1998). For consistency, we will refer to this statute under the redesignation as it aрpears today.
. 24 C.F.R. § 966.4(f)(12)(i)(A) (1996). The relevant portion of the regulation states:
The lease shall provide that the tenant shall be obligated ... [t]o assure that the tenant, any member of the household, a guest, or another person under the tenant’s control, shall not engage in ... [a]ny criminal activity that threatens the health, safety, or right to peaceful enjoyment of the PHA's publiс housing premises by other residents or employees of the PHA....
Id.
. 24 C.F.R. § 966.4(Z)(5)(i) (1996). The regulation states in its entirety:
In deciding to evict for criminal activity, the PHA shall have discretion to consider all of the circumstances of the case, including the seriousness of the offense, the extent of participation by family members, and the effects that the eviction would have on family members not involved in the proscribed activity. In appropriate cases, the PHA may permit continued occupancy by remaining family members and may impose a condition that family members who engaged in the proscribed activity will not reside in the unit. A PHA may require a family member who has engaged in the illegal use of drugs to present evidence of successful comple *507 tion of a treatment program as a condition to being allowed to reside in the unit.
