Trials haven't been discussed in detail, that I know of.
My understand is once you are captured/convicted/sentenced you will immediately "serve your time" but just losing spirit life.
You become incapacitated before CDG, so if you tried to fight your way out the law enforcement people could just knock you out and tack on more to your sentence. If they did kill you and you respawned and tried to flee, they would likely catch you (it takes an unknown amount of time to spirit walk back to your body so they would have time to prepare) and once they caught you they would increase your sentence and you would still serve your time (not double jeopardy because that requires 2 trials for the same charge and if you tried to fight your way out of a trial either the trial wasn't completed and/or new charges change the circumstances of the trial).
And yes, forging identification and signing a contract while under a disguise is possible to frame someone else when the contract is incomplete. If a sheriff isn't good enough in the forensic skill to detect a forgery it either better be a master forgery or a new sheriff.