The Iowa law is located at Section 280.13C of the Iowa Code under the title dealing with education and the chapter on school district and uniform requirements. (Iowa Code § 280.13C).
Iowa law requires the state high school athletic association to distribute information to parents, coaches, students and others on concussions and requires school districts and nonpublic schools to annually provide forms to parents/guardians on concussions to be signed and returned to the school prior to any athletic participation by the student. Finally, any student suspected of sustaining a concussion must be immediately removed from the activity and cannot return until they have been evaluated by a licensed health care professional trained in the evaluation and management of concussions and other brain injuries and the student has received written clearance to play.
Section 280.13 C of the Iowa Code is available online at:
http://search.legis.state.ia.us/nxt/gateway.dll/ic?f=templates&fn=default.htm (click on in the left margin for Iowa Laws and Rules and search concussion and then click on 280.13c Brain Injury Policies)
The following website offers additional information regarding Iowa concussion law:
http://www.iahsaa.org/Sports_Medicine_Wellness/Concussions/concussions.html