From the statute:
It is lawful under §§ 39-13-601 — 39-13-603 and title 40, chapter 6, part 3 for a person not acting under color of law to intercept a wire, oral, or electronic communication, where the person is a party to the communication or where one of the parties to the communication has given prior consent to the interception, unless the communication is intercepted for the purpose of committing any criminal or tortious act in violation of the constitution or laws of this state.
You are misreading it. It only takes one person to consent in a conversation, but you cannot record someone against their will. Even in the case of an attorney, he has to have permission from his client to record. You are again taking the writing out of context to fit your narrative. I feel like you are literally trying to defend being unethical. Are you in the practice of skirting ethics? Makes me wonder.
So, when is it illegal to record someone without their consent?
When no one on the recording has consented.
You can’t just bug a house and record everyone, you can’t just wiretap a phone and record everyone, you can’t just go around recording everyone all the time without anyone consenting to being recorded.
This is the primary reason most security cameras are visual only, no audio. Unless there is someone there constantly giving consent to be audio recorded, you can’t randomly record “everyone” on audio without anyone knowing.
This is also why police would need a warrant to record or wiretap a target, because they are making a recording where no one has consented. But they won’t need a warrant for a body cam or under cover officer with a hidden microphone because that officer has consented to the recording, and no other consent was required.
Side note:
a lawyer with a client, a lawyer could legally record his clients, because he consented to being recorded and doesn’t need the clients permission. But he couldn’t share those recordings with anyone else because it’s still protected by attorney client privilege, the recordings could only be for his own personal use. It would be as protected as written documentation.
Also, the above could be bad practice if these recordings happen to leak in anyway (which they did in the Cohen case) as you lose the attorney-client privilege as called out.
If you lose the attorney-client privilege, as an attorney it could be related to your negligence which would allow your client to file a complaint against you with Tennessee Professional Board of Responsibility for Negligence/Malpractice if these recordings end up in court.