If you look through the car from the front window to the rear or side window you get a pretty bright backlit view which helps you see the shadow of the seat belt going from the B-pillar to the drivers shoulder. If you practice looking for this it becomes very easy to spot when cruising around. For dedicated seat belt controls the police tends to set up a telephoto camera looking down the road so they can take long stable shots of the cars coming towards them. This gives them quite a lot of time to study you looking for the seat belt, and they can take photos to show in court if needed.
Neither of these techniques, and many others the police use, are fool proof. But they are quite effective. Enough so that you are taking a risk getting caught every time you drive without a seat belt. The risk of getting is reason enough to put on a seat belt when driving.
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