Security company licensing in South Dakota
South Dakota does not license security companies at the state level, so there is no state roster and no license number for a company to show you. That is not a mark against any company operating there.
South Dakota has no state security regulator — the state's list of every occupational licensing agency contains no security, guard or investigation board. Rapid City and Pierre license guard businesses municipally; Sioux Falls has no ordinance at all.
South Dakota Department of Labor and Regulation →What you can still check
There is a second license, and in South Dakota it may be the only one that exists: the guard’s own.
What a guard and a company should hold in South Dakota, and how to confirm it →