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An alcohol interlock device is the most effective way to ensure that the driver is suited to go behind the wheel. Designed for fail-proof alcohol breath testing, our alcohol interlock devices are comprehensive yet simple to use. Choose the AlcoSense FR9000 Interlock for advanced testing features, or go for the Stealth Alcohol Interlock Breathalyzer for a more convenient, portable option. Our alcohol interlocks are ideal for all users, from individuals to fleet drivers.