Okay, I’m confused.
So the police arrest, and they provide information including suggested charges to the DA.
Doesn’t the DA decide on the charges to actually file, not the police?
Isn’t there some time, a few days, before the DA files charges and the arrested party first appears in court?
Doesn’t the arrested party have an attorney that can argue that the charges are baseless?
Isn’t there a judge that decides if the charges have merit at this stage and doesn’t he consider that when setting bail?
Then grand jury
Then motions
Then trial
The process is adversarial by design, and I just don’t see an advantage to inserting an additional limitation on the initial charges, or even what it would be based on. If the DA thinks he can prove it, then he can charge it, and if it’s entirely without merit, opposing counsel can move to have it dismissed.
Consider that a felon is charged with murdering someone. The victim was shot dead. What would be the advantage of having one trial to convict on murder, and then a second trial to convict on unlawful possession of a firearm? As with your example, if the first crime is not proven then the whole case falls apart as it should.