USA Mobile Drug Testing Helps You Create a Safer, Happier, and More Productive Workplace! Simply call us and we’ll come to you, 24 hours a day, 7 days a week, whether your employees are in an office building, manufacturing facility, or even a remote job site like an oil rig or construction site. We only need each employee for about 15 minutes to administer their drug test, then they can get right back to work! Call us at 800-851-2021 to learn more or schedule an appointment.