Nevada is a 2 party state for telephone recording only. Refered to otherwise as wiretap. "NRS 200.620 Interception and attempted interception of wire communication prohibited"
Nevada is a 1 party state for in person/live recording. "NRS 200.650 Unauthorized, surreptitious intrusion of privacy by listening device prohibited"
Private conversations. If you are a participant, you can record.
If you are not involved in the conversation, you need to have the permission of somebody that IS involved in the conversation to record.
So, for interactions with police. If they are talking to you, and you are talking to them, the officer may believe it to be a private conversation, but:
1. you can't be considered surreptitious or intruding, as a participant in the conversation.
2. the police officer is a public official and has no expectation of privacy.
I love it when people who are supposed to enforce the law, don't know the law, or try to BS you by give parts and pieces of another law to intimidate. Trying to make the law fit their situation/need.