GWS's Toby Bedford has joined Brisbane Lions star Charlie Cameron in failing to overturn a three-game ban at the AFL Tribunal for tackling.

In the second of three cases on Tuesday night, Bedford was unsuccessful in his bid to downgrade a rough conduct charge on Richmond star Tim Taranto during Sunday's game at the MCG.

The Giants argued it was not a reportable offence, but AFL Tribunal chair Jeff Gleeson returned with a disappointing verdict for Bedford after deliberating for about 30 minutes.

"A reasonable player in Bedford's circumstances would have realised that by leaping at Taranto in the way that he did from behind was likely to drive him into the ground," Mr Gleeson said.

Bedford thought he "executed the perfect tackle".

"Even if I let go, I don't think it would've made much of a difference. I don't think I had enough time to do that," the Giants utility told the tribunal.

The AFL's lawyer Lisa Hannon believed Bedford should have kept his feet and stayed more upright in the tackle.

GWS's legal representative Anais d'Arville was scathing of the AFL's arguments.

"Bedford was faced with the choice of tackling in the manner he did or not tackling at all," Mr d'Arville said.

Bedford will miss matches against Gold Coast, Melbourne and Hawthorn.

Earlier on Tuesday, Brisbane Lions star Charlie Cameron also failed in his bid to overturn a three-match ban for rough conduct, with the AFL arguing he should have released West Coast co-captain Liam Duggan from a tackle instead of going to ground.

Cameron pleaded not guilty, saying his actions were not unreasonable in the circumstances.

But after deliberating for 45 minutes, AFL tribunal chair Renee Enbom disagreed and upheld the ban.

"Contrary to Cameron's evidence, we consider the vision clearly captures Cameron taking Duggan to ground forcefully," she said.

"It is the combination of the excessive force used in driving Duggan backwards with both of his arms pinned that makes the tackle unreasonable in the circumstances.