1 Consent of Independent Auditors We consent to the reference to our firm under the caption "Experts" and to the use of our reports on U.S. Alcohol Testing of America, Inc., and U.S. Drug Testing, Inc., dated May 20, 1996, in Amendment No. 1 to the Registration Statement (Form S-4 No. 333-3923) and related Prospectus of U.S. Alcohol Testing of America, Inc., for the Registration of common stock, warrants to purchase common stock, and the Consent Solicitation Statement to the Minority Stockholders of U.S. Drug Testing, Inc. ERNST & YOUNG LLP Riverside, California August 6, 1996