Yes, absolutely. In fact, probably one of its greatest utilities is at a checkpoint. The efficiency goes up. You have less screening time between each car or vehicle. When a vehicle comes up, instead of having to engage in conversation with the driver and really assess whether they've been drinking, it's much easier to use the tool and, if there's a negative reading, go on to the next vehicle.
They've actually done studies on how effective this is during a RIDE program, for example. Systematic stops are more effective when you use this.