THE Australian Sports Anti-Doping Authority has completed its investigation into the AFL and NRL, but former ASADA chief executive Richard Ings says it could be many months before it is known if any individuals will have a case to answer.

Ings also questioned why ASADA had not interviewed controversial figure, Dr Stephen Dank, a central player in the drama at both Essendon in 2012 and Cronulla the previous year.

"All the evidence that ASADA needs to collect has been collected and the people they need to speak to have been spoken to, and that mysteriously excludes speaking to Stephen Dank," Ings (pictured) told Fox Sports.

Dank, who has maintained his innocence throughout ASADA's drawn-out investigations, oversaw the supplements programs at the Bombers and Cronulla. Dank also worked with the Manly Sea Eagles.

While the investigations into the supplements programs at Cronulla and Essendon have finished, ASADA will continue to review its evidence and players from both clubs may yet be issued infraction notices.

Outgoing ASADA chief executive, Aurora Andruska, told a Senate committee on Wednesday night the 13-month investigation into the use of drugs in the AFL and NRL had been completed.

ASADA will now prepare briefs for retired Federal Court judge Garry Downes to review.

It will be up to him to determine whether cases against any individuals should be pursued.