502A.7  Liability of principals, controlling persons, and others.
  1.  The act, omission, or failure of an official, agent, or other person acting for an individual, association, partnership, corporation, or trust within the scope of the person’s employment or office shall be deemed the act, omission, or failure of the individual, association, partnership, corporation, or trust, as well as of the person.
  2.  A person who directly or indirectly controls another person liable under this chapter, a partner, officer, or director of the other person, a person occupying a similar status or performing similar functions, and an employee of such other person who materially aids in the violation, is liable jointly and severally with and to the same extent as the other person, unless the person who is liable by virtue of this provision sustains the burden of proof that the person did not know, and in exercise of reasonable care could not have known, of the existence of the facts by reason of which the liability is alleged to exist.
90 Acts, ch 1169, §7