32 C.F.R. § 635.7
(b) Army LE personnel will obtain a DNA sample from a civilian in their control at the point it is determined there is probable cause to believe the detained person violated a Federal statute equivalent to the offenses identified in DoDI 5505.11 (available at http://www.dtic.mil/whs/directives/corres/pdf/550511p.pdf), Fingerprint Card and Final Disposition Report Submission Requirements, and 32 CFR part 310, Department of Defense Privacy Program, except for the listed violations that are exclusively military offenses. For the purposes of this rule, DNA shall be taken from all civilian drug offenders, except those who are arrested or detained for the offenses of simple possession and personal use.