Duties versus discretion

COUNTIES: County Attorney Duties. Iowa Code ch. 331 (1993).  The county attorney has a duty to perform all responsibilities enumerated in Iowa Code sections 331.756, 331.323.  Beyond those specific duties, any action by the county attorney is solely within his or her discretion. (Reno to Maddox, State Senator, 6–24–93)
The preceding is the summary paragraph for Iowa Attorney General’s Opinion No. 93-6-4(L).  I have to wonder if the same logic regarding “duties” and “discretion” applies to other county officers?  And if it does not apply, then why doesn’t it apply?
Article I, Section 6 of the Iowa Constitution reads, “All laws of a general nature shall have a uniform operation; the General Assembly shall not grant to any citizen, or class of citizens, privileges or immunities, which, upon the same terms shall not equally belong to all citizens”.  [added 8 November 2010]
In other words, what is good for the County Attorney should be good for the County Recorder, Sheriff, Treasurer, … and Auditor.  [added 8 November 2010]
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