Testing Locations » Louisiana » Otis LA » Carlock Family Medical Clinic Otis – Carlock Family Medical Clinic Otis – Drug Testing Only (Preferred) Carlock Family Medical Clinic Otis – Carlock Family Medical Clinic Otis – Drug Testing Only (Preferred) Carlock Family Medical Clinic Otis – Carlock Family Medical Clinic Otis – Drug Testing Only (Preferred)2778 Highway 121Otis, LA 71466-9717 United States Call to confirm DOT collector is on duty