Iowa Code § 124.510
Any peace officer who arrests for any crime, any known unlawful user of the drugs described in schedule I, II, III, or IV, or who arrests any person for a violation of this chapter, or charges any person with a violation of this chapter subsequent to the person's arrest, shall within five days after the arrest or the filing of the charge, whichever is later, report the arrest and the charge filed to the department. The peace officer or any other peace officer or law enforcement agency which makes or obtains any quantitative or qualitative analysis of any substance seized in connection with the arrest of the person charged, shall report to the department the results of the analysis at the time the arrest is reported or at such later time as the results of the analysis become available. This information is for the exclusive use of the division of narcotics enforcement in the department of public safety, and shall not be a matter of public record.
Iowa Code § 124.510