That little card will have absolutely no real impact on how the LEO's will handle the situation. They will still mirandize you. Your answer once they have read you your rights is what they are looking for. It's a set kind of procedure. If that card gives you a warm fuzzy feeling, you go for it. If you had handed me that card, I'd simply be treating it like any other piece of evidence to be placed in the evidence locker for possible prosecution. It will be up to the prosecutor to either present it into evidence or not at trial if you are charged with anything.
Don't forget that there will almost certainly be a second trial. That will be the suit filed by the victim of your shooting or their survivors. That card will likely be very interesting to the plaintiff's attorney in that trial. They don't follow the same rules in a civil trial.