S.D. Codified Laws § 21-18-14.1
The plaintiff may obtain a one hundred twenty-day continuing lien on wages by garnishment. If a lien is to be obtained, the plaintiff shall mark on the caption of the garnishee summons "continuing lien" and all disclosure forms shall include the following:
Garnishee will continue to withhold the nonexempt portion of the defendant's earnings as they accrue through the last payroll period ending on or before one hundred twenty days from the effective date of the garnishee summons, or until the sum held equals the amount stated in the garnishee summons, or until the employment relationship terminates, whichever first occurs.
At the time of the expected termination of the lien, the plaintiff shall mail to garnishee an additional copy of the disclosure form upon which the garnishee within ten days shall make further disclosure.
SDCL 21-18-14.1