Cov khoom siv hluav taws xob tuaj yeem muaj cov khoom siv tshuaj lom thiab cov hlau hnyav. Yog tias muab pov tseg tsis tu ncua, cov ntaub ntawv no ua rau muaj kev phom sij rau tib neeg thiab ib puag ncig. Hauv qab no yog cov chaw hauv St. Louis County uas sau cov khoom siv hluav taws xob rau kev rov ua dua tshiab.
