Iowa Code § 189.19: Licenses.

The following provisions apply to all licenses issued or authorized under this subtitle:

1. Applications for licenses shall be made upon blanks furnished by the department and shall conform to the prescribed rules of the department.

2. For good and sufficient grounds the department may refuse to grant a license to any applicant; and the department may revoke a license for a violation of any provision of this subtitle or for the refusal or failure of any licensee to obey the lawful directions of the department.

3. Unless otherwise provided all licenses shall expire one year from the date of issue.