Opinion of the Court
tea to persons of church authority, and to warn particularly susceptible UDV members of the dangers of hoasca. See Preliminary Injunction ¶¶2, 5–12, 32–33, App. F to App. to Pet. for Cert. 249a, 250a–252a, 258a–259a. The injunction also provides that "if [the Government] believe[s] that evidence exists that hoasca has negatively affected the health of UDV members," or "that a shipment of hoasca contain[s] particularly dangerous levels of DMT, [the Government] may apply to the Court for an expedited determination of whether the evidence warrants suspension or revocation of [the UDV’s authority to use hoasca]." Id., at 257a, ¶29.
The Government appealed the preliminary injunction and a panel of the Court of Appeals for the Tenth Circuit affirmed, O Centro Espirita Beneficiente Uniao do Vegetal v. Ashcroft, 342 F. 3d 1170 (2003), as did a majority of the Circuit sitting en banc, 389 F. 3d 973 (2004). We granted certiorari. 544 U. S. 973 (2005).
II
Although its briefs contain some discussion of the potential for harm and diversion from the UDV's use of hoasca, the Government does not challenge the District Court's factual findings or its conclusion that the evidence submitted on these issues was evenly balanced. Instead, the Government maintains that such evidentiary equipoise is an insufficient basis for issuing a preliminary injunction against enforcement of the Controlled Substances Act. We review the District Court's legal rulings de novo and its ultimate decision to issue the preliminary injunction for abuse of discretion. See McCreary County v. American Civil Liberties Union, 545 U. S. ___ , ___ (2005) (slip op., at 19).
The Government begins by invoking the well established principle that the party seeking pretrial relief bears the burden of demonstrating a likelihood of success
