The police officer can record and see anything they want; but I'm not sure what that admission changes. Hasn't that always been true? A warrant is for things t

The police officer can record and see anything they want; but I'm not sure what that admission changes. Hasn't that always been true? A warrant is for things that other people who are not police wrote down (or otherwise recorded). If a cop had been somewhere and seen it, then they saw it; but in actual fact, they are not everywhere, and so the state wants to get people who were there to turn something over.