Police absolutely get this stuff wrong sometimes. I read this thread and it reminds me of an incident that happened to me personally about 30 years ago:
I had just graduated from A&M and was living with an Aggie friend in an apartment in the northern portion of the city of Dallas. We were both working for one of the largest CPA firms in the world.....big eight firm.....and we were both about as straight as they come at the age of 23.
One Thursday evening about 7:00pm I'm sitting in the apartment alone watching PBS and there is an aggressive (very hard and unusual) knock at the door. It was a very safe area so I usually just open the door right up, but this knock was so unusual, that I just cracked the door and said "hello." Standing outside the door were about six to eight folks in plain clothes and looking very rough....very long hair, unshaven etc.
The guy in front immediately and in an aggressive manner says: "Dallas police, please open your door! I didn't open the door, but asked to see his badge. He immediately showed me his badge and I immediately opened the door and invited them to come inside. About six of them immediately came in and spread around the room clearly feeling vulnerable and looking for a threat. Two remained outside the front door.
The lead guy....and the only one that talked the whole time then told me that they knew drugs had been being dealt out of my apartment and it would just be best for me if I confessed and told then everything I was up to. Clearly, I should have just said nothing and should have told them to leave, but I was young and dumb. Instead, I just laughed very hard and genuinely and told him to have a seat. I then spent 30 minutes in my living room with the six guys with them telling me about all the evidence they had that I was a major drug dealer. I just kept laughing each time and explaining to them how embarrassingly innocent my roommate and I were. Showed him my company ID, pointed out the fact that he could see I was watching a documentary on PBS when he knocked and on and on.
However, he just kept telling me how much better it would be if I just confessed. And, I just kept laughing in s genuine, "wow, gosh this is kinda neat in my boring life" way. He was relentless and I was clearly amused and enjoying some adventure in the middle of the week. I told him he clearly had bad information, the wrong address and the wrong people. He of course asked all about my room mate.....and I laughed even harder. He looked a little shocked when I told him my roommate was the biggest nerd in the world and was even a virgin. All the while with the other five guys standing around us looking very concerned. And again, they were all in plain clothes and looked pretty thuggish.....especially as compared to me.
Finally, he asked if they could search the place. I then asked him if he had a search warrant. He said he did not have a search warrant. I then told him: "Yes, you can search the entire place on the one condition that you put everything back exactly the way you found it and I mean exactly." He seemed shocked and then said: "okay, I'm not going to search, but we will be back." I laughed, said okay, and jokingly told him to get a hair cut.
Never heard a word about it again. My roommate refused to believe it actually happened.....although when the families get together these days and I tell the story to our Aggie children, I think he's starting to believe.
In hindsight, I was very lucky. Thank goodness they didn't just storm through the door as I would have fought them with every sliver of my being, including pursuing my hand gun. I should not even have let them in without a warrant......but I was young and dumb. But I can definitely say that the police are quite capable of getting this very serious stuff wrong and being ( or pretending to be) adamant that they do not make these sorts of mistakes. Thank goodness they didn't kill me first and then discover their mistake.