257.33  Prior enrichment approval.
  If the electors of a school district approved the use of the additional enrichment amount prior to July 1, 1991, under chapter 442, Code 1991, or section 279.43, Code 1991, the approval for use of the enrichment amount shall continue in effect until the expiration of the period for which it was approved and districts may use the additional enrichment amount during that period. However, section 257.28 applies to the use of the additional enrichment amount.
  Use of the additional enrichment amounts approved under chapter 442, Code 1991, is not affected by a change in the boundaries of the school district, except as otherwise provided in this section. If each school district involved in a school reorganization under chapter 275 has approved the use of the additional enrichment amount, and if the voters have not voted upon the question of participation in the instructional support program in the reorganized district, the use of the additional enrichment amount shall be in effect for the reorganized district that has been approved for the least amount and the shortest time in any of the districts.
89 Acts, ch 135, §33
; 
92 Acts, ch 1163, §61
; 
93 Acts, ch 8, §1
; 
2006 Acts, ch 1010, §78