So this happened a few years ago in a college town in California. A police officer came to the door of the house I was living in, and told us that someone had stolen a large theta from the front of a frat house, and that someone walking down our street at around 6:00am had seen the letter on the lawn in our front yard. Given that it was stolen property the police officer told us that he could get a search warrant for our house, and if we didn't let him in he would block our cars in with his car and wait for the search warrant. We had nothing to do with the stealing of the letter and woke up long after it was gone. We assumed someone had drunkenly stolen it and dropped it on our front lawn. One of my roommates ended up getting scared and letting the officer in so the point was moot, but I did not think the officer was being truthful in saying he could obtain a search warrant. The stolen property had been seen on our lawn, but there was no way anyone could prove (because it was false) that we had anything to do with stealing the letter, or that the letter was even still around.