The issue of a light, or "hair" trigger could be brought up by a prosecutor...let's face it, they are more concerned with conviction rates than they are with truth, common sense, or justice.
That being said, a light trigger on a ccompetition pistol, or even on a good custom pistol can be easily overcome by a good defense lawyer who asks the right questions to counter the prosecutor.
Pros: "Didn't you, in fact, lighten the trigger on your gun to make it MORE DEADLY like an old west gunfighter?
Defendant: "No, quite the opposite. I had the work done by a professional gunsmith to make the trigger lighter AND safer, to aid in accuracy, thereby making it MORE SAFE, and MORE ACCURATE thereby reducing the chance of a missed shot hitting a bystander. This is the gun I most often practice with, and am very competent with this pistol."
So, if the right answers are given, you are in a good shape. Just be sure to read ALL of Ayoob's books on self defense, and be prepared to field stupid questions out of left field.