Would humanity be better off? Or are people stupider when they are thinking out loud in front of recording devices?
How much do the lawyers deserve to know?
Nothing IMO. They can look at the company's actions. There's no need to invade the privacy of individual employees.
If they were trying to confiscate my personal mobile that I use for work I will never go along with that.
Luckily I live in Europe where the atmosphere is far less litigious.
This would work if we could punish wrongdoing regardless of intent, a standard probably reasonable against companies (they should know better after all). But this is not how it usually goes: Usually incompetence has to be ruled out and criminal intent has to be proven.