Can police enter your home if your not at home and is it possible for them to plant drugs in my home when I am on the way to the hospital?

Police may lawfully enter a home by consent, with a search warrant, or in the case of exigent (unusual or emergency) circumstances, such as when they believe a crime is in progress inside. While it is possible for police to enter your home and plant drugs there, just as it is possible for anyone else to do so, the entry would be unlawful.