A numbеr of Oklahoma businesses forbid their employees from bringing firearms onto company property. In March 2004, the Oklahoma legislature amended its laws to narrow the reach of such company policies. These new laws hold employers criminally liable for prohibiting employees from storing firearms in locked vehicles on company property. Various Oklahoma businesses subsequently filed suit seeking to enjoin the enforcement of the new Oklahoma laws, alleging they were (1) unconstitutionally vague; (2) an unconstitutional taking of private property, as well as a violation of Plaintiffs’ due prоcess right to exclude others from their property; and (3) preempted by various federal statutes. The district court for the Northern District of Oklahoma held that the challenged laws were preempted by the Occupational Health and Safety Act (OSH Act) of 1970 and permanently enjoined enforcement of the new laws. We have jurisdiction under 28 U.S.C. § 1291, and reverse.
I.
Numerous Oklahoma businesses maintain a policy of absolute prohibition on employees’ possession of firearms on company property, a violation of which may serve as grounds for termination. After several Oklahoma employees were, in fact, discharged for storing firearms in their vehicles on company parking lots, the Oklahoma legislature amended its firearms laws. Specifically, the legislature amended the Oklahoma Firearms Act (OFA) of 1971 and the Oklahoma Self-Defense Act (OSDA) of 1995 to prohibit property owners from banning the storage of firearms locked in vehicles located on the owner’s property. 1 See 21 Okla. Stat. §§ 1289.7a & 1290.22. 2
Whirlpool Corporation filed the initial action in this case seeking an injunction
*1203
against enforcement of the Amendments.
3
In November 2004, the district court entered a temporary restraining order (TRO) against enforcement of the Amendments, finding they were likely preempted by various federal laws. Before deciding whether to issue a permanent injunction, the district court certified to the Oklahoma Court of Criminal Appeals the question of whether the Amendments were criminal statutes. At the time, the status of the Amendments was uncertain. The district court was concerned that if the Amendments were civil in nature, the Oklahoma Governor and Attorney General might not have enforcement authority over the Amendments, thereby making them improper parties to this action. The Court of Criminal Appeals alleviated the district court’s concerns, ruling that the Amendments were, in fact, criminal statutes. See
Whirlpool Corp. v. Henry,
In October 2007, the district court ruled the Amendments were not an unconstitutional taking and did not violate Plaintiffs’ due process rights. The district court further ruled Plaintiffs lacked standing to assert a facial vagueness challenge. Lastly, the district court held the Amendments were preempted by the OSH Act’s general duty clause. 6 Accordingly, the district *1204 court permanently enjoined enforcement of the Amendments. 7
II.
Congress derives its power to preempt statе law under the Supremacy Clause in Article VI of the United States Constitution.
See Choate v. Champion Home Builders Co.,
The district court enjoined enforcement of the Amendments based upon conflict preemption, ruling that (1) gun-related workplace violence is a recognized hazard under the general duty clause; and (2) the Amendments impermissibly conflict with Plaintiffs’ ability to comply with the general duty clause, thereby thwarting Congress’ overall intent in passing the OSH Act.
See ConocoPhillips,
A.
Courts do not “lightly attribute to Congress or to a federal agency the intent to preempt state or local laws.”
Nat’l Solid Wastes Mgmt. Ass’n v. Killian,
B.
Congress’s declared “purpose and policy” in enacting the OSH Act was “to assure so far as possible every working man and woman in the Nation safe and healthful working conditions and to preserve our human resources.” 29 U.S.C. § 651(b). To effect its stated purpose, Congress authorized the Secretary of Labor and OSHA to set and enforce occupational safety and health standards for businesses. See 29 U.S.C. § 651(b)(3); see also OSHA’s Role, http://www .osha.gov/ oshinfo/mission.html. In addition to requiring employers’ compliance with OSHA’s promulgated standards, see 29 U.S.C. § 654(a)(2), Congress imposed upon employers a general duty to “furnish to each of his employees employment and a place of employment which are free from recognized hazards that are causing or are likely to cause death or serious physical harm.” 29 U.S.C. § 654(a)(1). This provision of the OSH Act, known as the general duty clause, was not meant to “be a gеneral substitute for reliance on standards, but would simply enable the Secretary to insure the protection of employees who are working under special circumstances for which no standard has yet been adopted.” S.Rep. No. 91-1282, at 5186 (1970).
The original impetus behind the OSH Act was danger surrounding traditional work-related hazards. See 29 U.S.C. § 651(a) (noting the OSH Act arose from concern surrounding “personal injuries and illnesses arising out of work situations”); S. Rep. 91-1282, at 5178 (describing at length the problems of industrial accidents and occupational diseases, without referencing workplace violence). In recent years, however, OSHA has recognized workplace violence as a serious safety and health issue. See, e.g., Workplace Violence, http://www.osha.gov/SLTC/ workplaceviolence/index.html (a section of OSHA’s website devoted to workplace violence). To that end, OSHA has issued voluntary guidelines and recommendations for employers seeking to reduce the risk of workplace violence in at-risk industries. See Guidelines for Preventing Workplace Violence for Health Care and Social Service Workers and Recommendations for Workplace Violence Prevention Programs in Late-Night Retail Establishments, both available at http://www.osha.gov/SLTC/ workplaeeviolenee/solutions.html. OSHA has not, however, promulgated any mandatory standards regarding workplace violence.
C.
Because the absence of
any
specific OSHA standard on workplace violence is undisputed, the district court correctly recognized that the only possible area of OSH Act preemption was under the general duty clause and the OSH Act’s overarching purpose. Thus, in finding preemption, the district court held that gun-related workplace violence was a “recognized hazard” under the general duty clause, and, there
*1206
fore, an emplоyer that allows firearms in the company parking lot may violate the OSH Act. We disagree. OSHA has not indicated in
any
way that employers should prohibit firearms from company parking lots. OSHA’s website, guidelines, and citation history do not speak at all to any such prohibition. In fact, OSHA
declined
a request to promulgate a standard banning firearms from the workplace.
See
Standards Interpretations Letter, September 13, 2006,
available at
The district court’s conclusion is also belied by the only opinion issued by an Administrative Law Judge (ALJ) concerning a general duty clause violation due to workplace violence.
See Megawest Fin., Inc.,
1995 OSAHRC Lexis 80 (May 8, 1995). In
Megawest,
the Secretary of Labor cited the operator of an apartment community located in a rough neighborhood for failing to take steps to prevent residents’ violent acts.
See id.
at *1-2, *6-7. The ALJ
reversed
the Secretary’s citation, ruling that potential violent behavior by residents did
not
constitute a “recognized hazard” within the meaning of the general duty clause.
Id.
at *32. In reversing the citation, the ALJ expressed the difficulties associated with requiring employers to abate hazards оf random physical violence.
See id.
at *28 (recognizing that the “hazard of physical assault ... arises not from the processes or materials of the workplace, but from the anger and frustration of people”). The ALJ stressed that an employee’s general fear that he or she may be subject to violent attacks is
not
enough to require abatement of a hazard under the general duty clause.
See id.
at *27;
see also Pa. Power & Light Co. v. Occupational Health and Safety Review Comm’n,
Undeterred by OSHA’s and
Megawest’s
express restraint in policing social behavior via the general duty clause, the district court held firearms stored in locked vehicles on company property may constitute a “recognized hazard.” In so finding, the district court relied heavily on OSHA’s general statemеnt that employers may be cited for a general duty clause violation “[i]n a workplace where the risk of violence and serious personal injury are significant enough to be ‘recognized hazards.’ ” Standard Interpretations Letter, December 10, 1992,
available at
http:// www.osha.gov/SLTC/workplaceviolence/
*1207
standards.html. The district court also relied on the ALJ’s indication in
Megawest
that it
might
be possible to violate the general duty clause for failure to prevent workplace violence.
See id.
at *29 (noting a high standard of proof is necessary to show that an employer recognized the hazard of workplace violence). Despite these general statements, OSHA’s action (or inaction) regarding this matter undermines the district court’s conclusion. The broad meaning of “recognized hazard” espoused by the district court is simply too speculative and unsupported to construe as the “clear and manifest purpose of Congress.”
Altria Group,
D.
The district court further reasoned the Amendments thwart the overall purpose and objective of the OSH Act. We disagree. The OSH Act is
not
meant to interfere “with states’ exercise of police powers to protect their citizens.”
Lindsey v. Caterpillar, Inc.,
Here, the Amendments conflict with
no
OSHA standard. Moreover, the Oklahoma Court of Criminal Appeals defined the Amendments as “public crimes” of general applicability “concerning] protection of the community as a whole rather than individual citizens.”
Whirlpool,
In sum, the facts before us do not approach the level necessary to overcome “the assumption that the historic police powers of the States [are] not to be superseded by the Federal Act.”
Altria Group,
III.
The district court rejected Plaintiffs’ argument that the Amendments are an unconstitutional taking of private property and a violation of Plaintiffs’ due process right to exclude others from their property. Plaintiffs raise these arguments as an alternative grounds for affirmance, however, and we address them accordingly.
See Medina v. City and County of Denver,
A.
Regulation of private property may be so onerous that it violates the Takings Clause of the Fifth Amendment and requires the government to provide compensation.
See Lingle v. Chevron U.S.A., Inc.,
*1209
Recognizing that a permanent physical invasion by the government has not occurred here in the traditional sense, Plaintiffs argue the Amendments are a physical
per se
taking because they require Plaintiffs to provide an easement for individuals transporting firearms. Thus, the argument goes, the Amendments constitute a permanent physical invasion akin to the “land-use exaction” takings in
Nollan
and
Dolan.
We do not find Plaintiffs’
per se
taking argument persuasive. A
per se
taking in the constitutional sense requires a permanent physical occupation or invasion, not simply a restriction on the use of private property.
See Loretto v. Teleprompter Manhattan CATV Corp. et al,
Rather, the facts here are more analogous to
PruneYard Shopping Center v. Robins,
Plaintiffs argue that, even if the Amendments are not a
per se
taking, a taking has nonetheless occurred under the standards set forth in
Penn Central. Penn Central
establishes that while a regulatory act may not constitute a
per se
taking, it can be “functionally equivalent to the classic taking in which government directly appropriates private property or ousts the owner from his domain.”
Lingle,
*1210
Plaintiffs’ takings argument also fails under the
Penn Central
inquiry. First, the only economic impact cited by Plaintiffs is the general claim (located in a footnote of their brief) that allowing firearms onto an employer’s property inevitably increases costs linked to workplace violence. A constitutional taking requires more than an incidental increase in potential costs for employers as a result of a new regulation.
See id.
at 538,
B.
In reality, Plaintiffs are less concerned about “compensation for a taking of [their] property ... but rather [seek] an injunction against the enforcement of a regulation that [they] allege[ ] to be fundamentally arbitrary or irrational.”
Lingle,
*1211
One professed purpose of the Amendments is the protection of the broader Oklahoma community. We need not decide the long-running debate as to whether allowing individuals to carry firearms enhances or diminishes the overall safety of the community. The very fact that this question is so hotly debated, however, is evidence enough that a rational basis exists for the Amendments.
See Village of Euclid v. Ambler Realty Co.,
For the foregoing reasons, we reverse the district court’s grant of a permanent injunction.
Notes
. The original amendment to the OFA was passed in 2004. A revised version, 21 Okla. Stat. § 1289.7a, was passed in 2005 which included protection from tort liability for property owners. The original 2004 amendment to the OSDA, 21 Okla. Stat. § 1290.22, remains in effect. Thus, before us on appeal are the 2005 OFA amendment and the 2004 OSDA amendment. Throughout this opinion, we collectively refer to these new laws as "the Amendments.”
. 21 Okla. Stat. § 1289.7a provides:
TRANSPORTING OR STORING FIREARMS IN LOCKED MOTOR VEHICLE ON PRIVATE PREMISES — PROHIBITION PROSCRIBED — LIABILITY—ENFORCEMENT
A.No person, property owner, tenant, employer, or business entity shall maintain, establish, or enforce any policy or rule that has the effect of prohibiting any person, except a convicted felon, from transporting and storing firearms in a locked motor vehicle, or from transporting and storing firearms locked in or locked to a motor vehicle on any property set aside for any motor vehicle.
B. No person, property owner, tenant, employer, or business entity shall be liable in any civil action for occurrences which result from the storing of firearms in a locked motor vehicle on any property set aside for any motor vehicle, unless the person, property owner, tenant, employer, or owner of the business entity commits a criminal act involving the use of the firearms. The provisions of this subsection shall not apply to claims pursuant to the Workers’ Compensation Act.
C. An individual may bring a civil action to enforce this section. If a plaintiff prevails in a civil action related to the personnel manual against a person, property owner, tenant, employer or business for a violation of this section, the court shall award actual damages, enjoin further violations of this section, and award court costs and attorney fees to the prevailing plaintiff.
D. As used in this section, "motor vehicle” means any automobile, truck, minivan, sports utility vehicle, motorcycle, *1203 motor scooter, and any other vehicle required to be registered under the Oklahoma Vehicle License and Registration Act.
21 Okla. Stat. § 1290.22 provides:
BUSINESS OWNER'S RIGHTS
A. Except as provided in subsection B of this section, nothing contained in any provision of the Oklahoma Self-Defense Act, Section 1290.1 et seq. of this title, shall be construed to limit, restrict or prohibit in any manner the existing rights of any person, property owner, tenant, employer, or business entity to control the possession of weapons on any property owned or controlled by the person or business entity.
B. No person, property owner, tenant, employer, or business entity shall be permitted to establish any policy or rule that has the effect of prohibiting any person, except a convicted felon, from transporting and storing firearms in a locked vehicle on any property set aside for any vehicle.
. Whirlpool has since withdrawn from the litigation and numerous other companies have intervened as Plaintiffs. We collectively refer to the group of companies currently seeking a permanent injunction as "Plaintiffs.”
. We agree with the district court, as do both parties, that the Governor and the Attorney General were properly named as Defendants. Oklahoma law grants enforcement authority of the Amendments to the Governor and Attorney General.
See
74 Okla. Stat. § 18(b)(A)(1)-(3) (conferring authority to the Attorney General, subject to the direction of the Governor, to appear for the state in criminal appeals and in all cases of particular interest to the state). As such, a sufficient case or controversy exists between Plaintiffs and Defendants.
See Wilson v. Stocker,
. A thorough description of this case’s procedural history is provided in the district court’s opinion.
See ConocoPhillips Co. v. Henry,
. The district court intimated that it believed the Amendments may conflict with the Brady Handgun Violence Prevention Act (Brady
*1204
Act), 18 U.S.C. § 922.
See ConocoPhillips,
. When the district court issued its permanent injunction, the TRO was still in effect pursuant to the parties’ agreement.
. Despite the district court’s assertion to the contrary, its definition of “hazard” is not supported by
Psychiatric Hospital in Chicago Cited by OSHA for Workplace Violence,
. We note that OSHA recently issued a letter to Oklahoma State Senator Jerry Ellis in response to the present case stating that "[g]un related violence is not a recognized occupational hazard in industry as a whole” and that "[OSHA] do[es] not believe that, as a general matter, the general duty clause of the OSH Act preempts [the Oklahoma Amendments].” Letter from Thomas Stohler, Acting Assistant Sec'y of Labor, to Jerry Ellis, Oklahoma State Senate (Jan. 16, 2009).
. The second category of per se takings, which is not at issue here, is known as a *1209 "total regulatory taking,” id. at 548, and involves regulations that deprive an owner of all economically beneficial use of his or her property. Id. at 538.
. Plaintiffs also argue the Amendments are unconstitutionally vague. Facial vagueness challenges “to statutes which do not involve First Amendment freedoms must be examined in light of the facts of the case at hand. One to whose conduct a statute clearly applies may not successfully challenge it for vagueness.”
United States v. Day,
