What should you avoid doing with the switch at a collision scene to preserve evidence?

In the context of preserving evidence at a collision scene, it is crucial to avoid altering any potential evidence that could provide insights into the events leading up to and during the collision. By not turning the switch on or off, you ensure that any electronic data or system status remains unchanged. This preserves the integrity of the vehicle's data, such as airbag deployment status or other electronic functions, which can be critical in assessing fault or understanding the dynamics of the collision.

Other actions, like keeping the switch permanently off, could alter the vehicle's status or function in a way that obfuscates important evidence. Disconnecting the battery also risks losing crucial data recorded by the vehicle’s electronic systems. Documenting its function, while important, doesn’t directly relate to the preservation aspect in the moment of securing the scene. Therefore, maintaining the current state of the switch is essential for ensuring that all available evidence is intact and can be accurately analyzed later.