Plot hole: The villain's plan can work and fool the judiciary system because of extraordinary coincidences out of his control. He needs to steal the gun of his wife's lover in broad daylight without employing any modicum of stealth; he needs said lover to be the particular negotiator assigned to that case. He then needs the two agents standing by the door to be unable to hear any part of the confession he spews out, and to be absolutely sure that the detective has no recording device or radio contact throughout the ordeal. Not just that, but the spry septuagenarian also switches guns with cat-like ability - Nunally left his gun by the open door, where the other two agents are waiting. So the other two policemen had to be deaf and blind for his plan to work. He does not even have any time to switch guns with Nunally from our perspective as viewers; for the tiny five seconds when he is off camera and out of Nunally's direct eyesight, he is taunting him while supposedly moving around the large entrance to grab the gun.
Plot hole: According to the deposition of the policeman, the police were on the premises at exactly 5:12 PM. Considering that Lt. Nunally started his shift only at 6 PM (as per Crawford's phone call, even if by any logic it was the kind of fact a meticulous planner like him, with seemingly unlimited access to intelligence, would have to know already), Crawford concocted his master plan that hinged on Nunally being called up for the situation at a time when he was, in fact, not on duty. (00:45:00)
Plot hole: *SPOILER* Toward the end of the movie, Ryan Gosling goes to Hopkins' house where Hopkins is tricked into not only confessing again, but giving Gosling the murder weapon, after they are back in court and Gosling is the acting prosecutor. This would be a conflict of interest due to the fact that Gosling is a witness.
Suggested correction: First, the gun that Beachum took from Crowford's house was not the murder weapon. It was Crowford's unfired gun. He only took it out of the fear of his life. Second, Beachum entered Crowford's house with police supervision. If he plays it by the book, Crowford's confession is valid. In that case, supervising officers will stand witness, along with a recording confirming their testimony. Third, Beachum doesn't need the confession anymore. He was amply clear on that matter.
You are on point for the corrections, but they involve just mostly context/details, don't they? The text of the entry should be polished a little, but the core issue is valid, I think; Beachum would never be the acting prosecutor in a case when he is the key witness as well. If it's a case for the "murder," he has to be on the stand for practically everything; even if we exclude him from the confession to the shooting, as you suggest (and even if it should never be litigated to begin with), he still is integral to the pulling the plug phase (he was literally there as it happened and did everything to prevent it). We can just assume that he will be forced to hand the prosecuting role over to someone else later, and he was just there for 5 minutes to gloat before the movie credits run, but it's kind of funny.
Beachum doesn't have to testify, neither for the confession part nor for the "pulling of the plug." I've already covered the former. For the latter, the fact that the woman is now dead is enough. If necessary, the attending doctors could testify that the woman "would have outlived all of them."
Beachum received the confession under "police supervision," as you called it, which still involved him being the only person in the house with the defendant. You mentioned a recording in the earlier comment; are we just to assume he took one, or is there a visual hint I missed? He was also the person who fought for the court order to the point of being physically tackled in front of the victim's deathbed—so doctors and security staff defiant of such an order would be on trial too, I suppose? Since, again, this 'murder' was not even committed by Crawford. So how would Beachum not be a crucial witness, often the only witness to cover that part of the story?
OK. You want to assume Crawford's confession was for the viewer's benefit entirely, and there was no wiretapping? Fine. The police have the gun now, hence proof of the first actus reus. Hospital staff tackled Beachum, but Crawford can't pin the murder on them when he has two counts of actus reus and twice demonstrated mens rea. Courts always hear such nonsense as "I didn't kill him; I shot him. The bullet and the fall killed him" (Collateral, 2006). Shooting someone is actus reus.
I am sure you are right on the Latin, especially since it's hard to imagine the trial going the way it went the first time around to begin with, and I am not getting into the rabbit hole of what exactly could legally be relitigated. But still and again, what does this have to do with the original point being made, that some other guy would be the one leading the trial, since Beachum would be realistically called in as a witness, even a hostile one? I mean, I honestly didn't think it would be much of a point of contention; it's just something there for the audience. I followed the lead about the 'witness' part the OP ended on, but seriously, a conflict of interest would be invoked just because of all the personal first-hand, hands-on involvement in the facts.
I explicitly told you what happens if the court struck the confession from the record. (The gun happens.) And yet, here you are, saying "Beachum would be realistically called in as a witness"! This correction is turning into a confrontation. Also, don't conflate "involvement" with "conflict of interest." The latter means someone has different de facto and de jure motives. Beachum always had one motive: to convict Crawford.
Far from me to be confrontational, and sorry if I came across that way. I guess I simply don't get it; it happens. Specifically, if I stated again the point about the witness, it wasn't because I was blindly disregarding what you said (check the words immediately after the ones you quoted), but it's pointless to delve further into something that goes beyond the original mistake. You just directly addressed the meaning of conflict of interest, which was what the OP talked about. I simply felt the initial correction posted was not doing that; now it does, and I am not disputing your knowledge on the topic, especially not having any of my own. Cheers.
Plot hole: In this film, a murderer (Mr. Crowford) goes free after recanting his confession (alleging duress) and concealing the murder weapon. The film forgets the most damning evidence: The perp and the victim had been alone in a closed room from which witnesses had heard shots fired. The perp himself establishes that he had motives. He cannot go free without an astounding alibi.
