RT Corp was incorporated in Laramie, Wyoming in 1988. The principal business of the corporation is the manufacture and distribution of Certified Reference Materials (CRMs), Quality Control (QC) Samples, and Proficiency Testing (PT) Samples. Originally focused in the environmental sector, RT Corp has since expanded its focus to include the pharmaceutical sector. Since its inception, RT Corp has become world famous for its production of “Real World” CRMs and fortified matrices CRMs. RT Corp was one of the original Proficiency Test providers recognized by the US EPA.