AFL chief executive Andrew Demetriou was last tested for illicit drugs 12 months ago under the league's controversial three-strikes policy.

Demetriou has hailed the league's illicit drugs code as the most robust in world sport, after figures released this week showed a drop in positive tests.

League executives and members of the commission are subject to testing, but coaches and umpires are not.

"Our executive and our commission are all subject to random drug testing," Demetriou told Fairfax Radio in Melbourne on Friday.

"We said if the players are going to sign up to an illicit drugs policy, if it's good enough for them, it's good enough for us.

"We think we have the most robust illicit drugs policy that's in world sport now.

"The last time was probably over 12 months ago when someone came into my office and said `over here, into this toilet' - and away I went."

Demetriou also said on Friday that Collingwood star Dane Swan had been misguided with his humour earlier in the week with comments about the anti-doping policy.

Swan went on Twitter to protest about several early-morning drug tests.

These were understood to fall under the AFL's standard anti-doping policy, which is separate from the illicit drugs code.

"In fairness to him, I assume he was trying to be a bit flippant about it and funny," Demetriou said.

"His twitters for the rest of the day reflected that, but it's actually not funny.

"We, like other sporting codes, have all signed up to the same world anti-doping code, which says that athletes can be tested at any time for performance-enhancing drugs.

"That's what you sign up for when you become a professional athlete."

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