You are talking about the air bag sensor, yes it's always recording. Every new car has one it's mandatory. In the event of an accident law enforcement needs to obtain a search warrant to use the data against you. I have done the above for work. But I only go through the trouble when it's a fatal accident to reconstruct it. It records 5-7 seconds before deployment or non-deployment depends on the make of the car. As far as I know law enforcement is the only one who have the equipment to read the data. Hope it helps you under stand.
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