Testing Locations » Texas » Houston TX » Direct Occupational Centers Llc – Direct Occupational Centers Llc – Drug Testing Only (Preferred) Direct Occupational Centers Llc – Direct Occupational Centers Llc – Drug Testing Only (Preferred) Direct Occupational Centers Llc – Direct Occupational Centers Llc – Drug Testing Only (Preferred)1920 Rankin RoadSuite 130Houston, TX 77073-5113 United States