In Pollard, we held that when one invites an undercover agent and an informant into his residence, the agent or informant can summon back-up officers for assistance, and that these back-up officers are acting within their constitutional limits when they enter since no further invasion of privacy is involved once the undercover officer and informant make the initial consensual entry. Today, we extend that concept to cases in which a confidential informant enters a residence alone, observes contraband in plain view, and immediately summons government agents to effectuate the arrest.
The courts tell us to choose our friends wisely. Cf. Maryland v. Pringle (If you ride in a car with dope dealers, you might get arrested). Since the Constitution does not apply to private actors, we can exclude people - rationally or not - from our homes. When we invite people into our homes, with drugs in plain view, aren't we surrending our right to privacy?
Imagine a person saying that his right to privacy was violated when a guest saw sex toys sitting on the coffee table. Could the person really expect the guest not to see the toys? If you come over to my place (which is unlikely since I am extremely private and hermit-like), you'll see a small humidor and the latest issue of Cigar Aficionado. I can't take offense when a guest learns that I smoke cigars.
It would be a different case if the informant had went into Yoon's bedroom, snooped in his cupboards, or otherwise exceeded the behavior we expect of guests. If I invite you into my living room, you can't look around my bedroom. But in Yoon, the informant saw the marijuana on the coffee table.
Why should Yoon bother me? What am I missing?