The 4th Amendment right against warrantless searches of a person’s home is a pillar of Americans’ constitutional liberties. Before a police officer, or any other government official, can enter your home, they must show a judge that they have probable cause that they will discover specific evidence of a crime.

There are some limited exceptions to this right. There is an “exigent circumstances” exception. If a police officer looks through a home’s window and sees a person about to stab another person, the officer can burst through the door to prevent the attack. There is also the “emergency aid” exception. If the officer looked through the same window and saw the resident collapsing from an apparent heart attack, the officer could run into the house to administer aid. Neither of these cases violates the 4th Amendment and few would argue that it should be otherwise.

https://www.forbes.com/sites/evangerstmann/2021/02/05/supreme-court-will-decide-whether-police-can-enter-a-home-to-seize-guns-without-a-warrant/