John Doe uses a gun to kill a criminal in self defense. That gun, the one used, is taken as evidence by law enforcement so it can be investigated and/or used trial or for whatever reasons need be.
In the aftermath, tensions heighten and the state charges Mr. Doe with murder. John Doe now has to go through a trial. Months later the trial is finally here. Trial starts. Gun is shown in trial. Witnesses testify all truths. Both sides plead their case to the jury. Trial ends with jury acquitting John Doe because they believe from the evidence they were shown that his actions were legally justified.
So now at this point..
THE QUESTION: Can John Doe ask to get his gun back now? Or Can the state/or L.E. give John Doe his gun back at this point?
If "No." Then why not?