Ofcourse but you must have a valid reason otherwise it shall not be worth there time.
He was in someone else's car.
Yes! Police can enter a third parties home without a warrent when in pursuit of a suspect.
Report them as a runaway and ask the police to return him home.
18 you cannot be a minor and move out without parental consent or any repurcussions from police if they are brought into the picture...
Fourth Amandment
For the police to enter your home without you permission they need a warrant to do so from a judge/court. Or, they need probably cause to believe an emergency or crime is in progress, at least in the U.S.
oh hell yeah they can!
why not!?!?!?!? Police can't enter your home without a search warrant or if you let them in. Usually if you have a security camera for the protection of your home, they won't bother with it. They may ask you to see the tapes if something happens on your property or in the field of view of your camera. It's not illegal to check your home when you're not there, unless you spy on your neighbors without them knowing.
Nothing, if they don't know.
Specifically in Florida?
If they have probable cause that a crime is taking place inside. No they still have to have a warrant.
In some situations, yes, the police can arrest a minor at home without their parents present, but they must follow specific protocols and have a valid reason for the arrest. Minors typically have the same legal rights as adults when it comes to being arrested.