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

((1)) the conduct prohibited under ;

((2)) the preparation, solicitation, attempt, threat, or conspiracy to engage in conduct prohibited under ; 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)) ** .—** 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.