A Wisconsin judge refused Friday to lower the bond of a man suspected of running an illegal operation to manufacture thousands of vaping cartridges filled with THC.

Three more people have been charged in what investigators say was a large black-market operation for the manufacture of THC-vape cartridges in southeastern Wisconsin.

Authorities have made a fourth arrest in connection with a black-market business for THC-vape manufacturing in Wisconsin.

Kenosha County prosecutors say the mother of two brothers accused of making vaping cartridges containing THC oil was aware of the illegal activity and allowed some products to be manufactured at her real estate office.