915.2  Immunity.
  This chapter does not create a civil cause of action except where expressly stated, and a person is not liable for damages resulting from an act or omission in regard to any responsibility or authority created by this chapter, and such acts or omissions shall not be used in any proceeding for damages. This section does not apply to acts or omissions which constitute a willful and wanton disregard for the rights or safety of another.
98 Acts, ch 1090, §2, 84