Most LEOs are empowered to make a probable cause (PC) arrest for felonies without a warrant. The defendant will then usually get a hearing before a magistrate judge at the next available appearance before a judge. Often that means the person will spend the night in jail until the next day. At the hearing the judge will determine if the officers were correct in their assessment of probable cause, and if so will determine what if any bail should be set.
Meaning if the cops that respond to the shooting think that there is reason to believe the shooting was not justified you could be arrested on the spot. If that were the case you would likely have your hearing the next business day.
Keep in mind things can vary a bit depending on jurisdiction, but that is generally how it works. A lot of factors will determine whether the cops merely collect evidence, and wait to make arrests, or whether they collect evidence and make arrests.
Meaning if the cops that respond to the shooting think that there is reason to believe the shooting was not justified you could be arrested on the spot. If that were the case you would likely have your hearing the next business day.
Keep in mind things can vary a bit depending on jurisdiction, but that is generally how it works. A lot of factors will determine whether the cops merely collect evidence, and wait to make arrests, or whether they collect evidence and make arrests.