On what grounds though. To take legal action you would have to show the process was flawed or that the panel had come to a decision that was flawed. The process will of been signed off by a legal team and the panel has come to a decision based on their opinion which is going to be incredibly difficult to overturn.
I think there was very little we could do apart from Unsworth stating he thought the decision was wrong which is what he did.
The process is basically labelling a professional athlete a cheat based on subjective rather than objective evidence. This isn't like doping tests.
To me, it's defamation. Similarly, I think Rodriguez is right to seek legal advice over being called a racist on very flimsy grounds and, yes, if Firmino is charged he would be right to do it too. Because being called a cheat or a racist is a very serious allegation to make and you should have very concrete grounds to do so - the processes the FA have are far from concrete.