A licensed private investigator can legally record you on video anytime you are in public view, and can legally record a phone call or in-person conversation without telling you, since Colorado is a one-party consent state under C.R.S. 18-9-303. That permission has real limits, though. It does not extend inside your home, through your windows, behind a privacy fence, or into certain interviews conducted for an attorney. Here is exactly where that line sits.
Can a Private Investigator Legally Follow and Video Record You in Public in Colorado?
Yes. Any time you are in public view, walking to your car, driving, shopping, or eating at a restaurant, an investigator can legally get video of you. The deciding factor is not whether the investigator has permission; it is whether you have a reasonable expectation of privacy in that exact moment. Standing in your own driveway, walking through a parking lot, or sitting on a restaurant patio does not carry that expectation, so it is fair game for a properly licensed investigator working a legitimate case. For a closer look at how investigators actually work a case like this in the field, see surveillance skills unique to private investigators.
Can a Private Investigator Record Your Conversations Without You Knowing?
Sometimes, and this is where Colorado’s specific law matters. Colorado is a one-party consent state, meaning a recording is legal as long as one person in the conversation knows about it and agrees. If the investigator is actually part of the conversation, in person or on the phone, that investigator’s own consent satisfies the law, and you do not need to be told. What an investigator cannot legally do is plant a hidden recorder and capture a private conversation between two other people where neither one is aware, or knows the investigator is listening. That crosses from one-party consent recording into illegal wiretapping.
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Are There Places a Private Investigator Cannot Legally Record You?
Yes. The moment you step into a space that is not open to public view, a doctor’s office, a restroom, a locker room, or your own home, you regain a reasonable expectation of privacy, and legal video recording stops. A licensed investigator can capture you walking into a doctor’s office but cannot follow you inside. The same goes for a public restroom, which stays legally private even though members of the public use it.
Can a Private Investigator Record You Through a Window or Behind a Fence?
No. Standing in front of your own window in your own home does not put you in public view, even if someone on the street could technically see you. The same protection applies behind a privacy fence. An investigator standing in a public alley cannot point a camera through the slats or over the top of your fence and record what happens in your own backyard. Both situations still carry a reasonable expectation of privacy despite happening somewhere a camera could physically reach.
What Happens When an Attorney Is Involved in the Investigation?
The rules tighten further. Attorneys are not permitted to obtain evidence through deception, and an investigator working directly for an attorney is treated as an extension of that attorney. That means posing as someone else to strike up a conversation, then recording it without the other person’s knowledge, is off the table on an attorney-directed case, even in a one-party consent state where the same move might otherwise be legal. If a private investigator ever wants to keep recording once you invite them into your home to talk, they are required to tell you the conversation is being recorded and get your permission to continue, not just one or the other.
What Should You Do If You Think a Private Investigator Crossed the Line?
If you believe someone recorded you inside your home, through a window, behind a fence, or captured a private conversation you were never part of, that goes beyond what Colorado law allows a private investigator to do. A tracking device is held to a similarly strict standard, see when GPS tracking becomes illegal for how that same reasonable expectation of privacy standard applies to a tracker placed on your vehicle. A licensed, properly trained investigator understands exactly where these lines sit, which is the difference between evidence that holds up in court and evidence that gets a case thrown out, or worse, exposes the investigator and the client to real legal liability.