In a recent unpublished opinion, the Fourth Circuit explains the difference between "experiential" and "scientific" based expert testimony. The trial court will require two different standards when deciding whether to admit the testimony or not:
United States v. Blunder, No. 18-4595, 2019 WL 6275653, at *2 (4th Cir. Nov. 25, 2019)
In SC state court, there isn't a set test for nonscientific expert testimony:
Here is a recent post about scientific vs non scientific evidence in state court.