Priority One Drug Testing Priority One Drug Testing 904 W. Grant Road Tucson, Arizona 85705 Office: 520-682-4005 Fax: 520-616-4536 Hours of Operation: 8:00am to 12:00pm & 1:00pm to 5:00pm Monday - FridayLast Drug Testing Appointment at 4:30pm Your Name (required) Your Email (required) Subject Your Message