Why? You don't need that level of detail in an RPG. Combats don't include parrying, riposte, slowed reaction times due to bleeding from cuts, halved movement from a moderate stab wound to the leg, and on and on. Real life level of detail just isn't necessary.
What I would need to do is roleplay any witnesses, the prosecutor, the judge, a bailiff or guards, and possibly a defender. The PCs may or may not have a defender, depending on the nature of the government, and if there is a PC not on trial, a PC may step into the role of defender.
From there it's just roleplaying and presenting the evidence. A PC defender might get social skill rolls when appropriate at DCs set by me depending on the situation.