In SC it is legal to carry a gun in your vehicle as long as it is in a "latch-able" container. (ie, Glove box, console, pistol case or luggage)
South Carolina is typically a VERY gun friendly state. I know dozens of LEOs; and all of them are very PRO CC.
SC State Troopers are very much anti-DRUG. (I can almost guarantee you that is what a SC troopers #1 objective is when they stop an out of state speeder & search a vehicle.)
- How did the trooper know you had a firearm?
- Did you consent to search?
- Did you volunteer?
- Were you asked about firearms?