Crash investigators don't need to take the drivers word for it. They have devices that plug into what is left of the ODB2 port or directly into the cars ECU and

Crash investigators don't need to take the drivers word for it. They have devices that plug into what is left of the ODB2 port or directly into the cars ECU and download the contents of the Event Data Recorder, which gives a usually 30 second snapshot of all the data leading up to an airbag deployment.