Testing Locations » Texas » San Marcos TX » Ferguson Family Practice & Occ Health – Ferguson Family Practice & Occ Health – Drug Testing Only (Preferred) Ferguson Family Practice & Occ Health – Ferguson Family Practice & Occ Health – Drug Testing Only (Preferred) Ferguson Family Practice & Occ Health – Ferguson Family Practice & Occ Health – Drug Testing Only (Preferred)1228 N Hwy 123San Marcos, TX 78666-7730 United States