Earlier in the week, the Australian Football League excluded Essendon from its finals series, fined the club $2 million and suspended its head coach for 12 months for bringing the game into disrepute amid concern over its 2012 supplements program. The AFL said those sanctions related to governance and management flaws at the club, not doping.
The link between Essendon and rugby league is a sports scientist who ran the supplements program for the Bombers last year and earlier work for NRL club the Cronulla Sharks. Sharks players have been urged to give evidence to investigators but none have so far been charged.
"Our resolve on these issues remain clear. We will act on evidence when it is fully available," Smith said. "Everyone should be in no doubt that ASADA is continuing its investigations and that we will continue to work closely with them.
"I stress that we do not have evidence at this stage that would warrant any further action against any individual or club."
The 23-year-old Earl played for Sydney Roosters and Penrith before joining Canberra in 2012. He has played 29 NRL matches for Canberra, and has scored nine tries in 17 matches this season. One of his tries in the 2010 season was used in NRL promotional advertising.