All 15 commandos were released after questioning, with two of them being "cleared of any wrongdoing," Lt. Col. Michael Burns, spokesman for the USASOC, said.
Burns added that the investigation by the US Army Criminal Investigation Division was not over, thus it was inappropriate to discuss any details.
"All soldiers have the right to due process, including the presumption of innocence under the Uniform Code of Military Justice," the spokesman said.
Burns added that the USASOC did not condone any drug use and was fully cooperating with the investigators.
No soldiers were detained or charged.