We have a policy that states all voice/sound recordings should be turned off.
This was in response to a case study I read where a carrier/trucker was sued in the US after a car ran a stop sign and drove into him. The defense lawyer sent the whole dash cam video of 2 hours to the plaintiff lawyer thinking that the plaintiff has no case. The plaintiff lawyer in court played to a jury a conversation that the driver had with his spouse about 45 minutes earlier. In this conversation, which only heard the drivers side, the driver verbally abused his spouse in a 15 minute ordeal that probably should have had 3/4 of it censored. The defense lawyer tried to object but the plaintiff lawyer said that it makes a case for the driver's state of mind and was overruled. In the end the jury awarded full compensation to the plaintiff. The case study was written to show that the plaintiff lawyer used this situation to 'poison' the jury. The jury punished the driver for his interaction with his spouse, not the actual inferred negligence on the driver. The defense lawyer didn't see this angle coming and was unprepared and unsuccessful in turning the trial around to sway the jury back into thinking about the actual harm done or failure to act committed by the driver. This case study was actually written for lawyers to ensure that they only send the pertinent evidence(in this case, the 30 seconds before the crash) and to deny all other dash footage unless the judge deems necessary. My policy responds and makes it unavailable to the lawyer to make that mistake. I wished I copied that case study because I cannot find it on the internet any more.
I also have a policy against driver facing cameras for the same reason. I do not need a camera recording something that a jury, with no truck driving experience or previous exposure to trucking, to think that something the driver did 10 minutes before an incident was so dangerous that they need to punish the driver.