In Ontario, can a private investigator legally record a private conversation where they are a participant, without informing the other parties?

1. Yes, as long as the investigator is a party to the conversation, this is generally permissible under Canadian law (one-party consent).
2. Only if there is a direct threat of violence.
3. Only if the conversation takes place in a public space.
4. No, it is always illegal to record without all parties' consent.