(a)  In General.⁠—The United States may obtain in a civil action an injunction against⁠—

(1)  the conduct prohibited under section 175 of this title;

(2)  the preparation, solicitation, attempt, threat, or conspiracy to engage in conduct prohibited under section 175 of this title; or

(3)  the development, production, stockpiling, transferring, acquisition, retention, or possession, or the attempted development, production, stockpiling, transferring, acquisition, retention, or possession of any biological agent, toxin, or delivery system of a type or in a quantity that under the circumstances has no apparent justification for prophylactic, protective, or other peaceful purposes.

(b)  Affirmative Defense.⁠—It is an affirmative defense against an injunction under subsection (a)(3) of this section that⁠—

(1)  the conduct sought to be enjoined is for a prophylactic, protective, or other peaceful purpose; and

(2)  such biological agent, toxin, or delivery system is of a type and quantity reasonable for that purpose.