A warrant may be necessary for the police to search the server that Facebook is running on. It is also possible that FB may choose to allow the search without a warrant.
If the 'search' is simply examining publicly available information on any web page, no. A warrant would not be necessary.
Yes all police officers need a search warrany in the UK
Yes, the police do need a warrant to search your locked roof mounted cargo box.
Yes, police generally need to show a search warrant before conducting a search, unless there are specific circumstances that allow for a search without a warrant, such as consent or exigent circumstances.
Probable cause.
They must provide a judge with probable cause to do a search.
Yes. The occupant/resident need not be present at the time the warrant is executed.
Yea
yes they have to have a paper signed by a judge
no they do not have to show you all they need is the search warrant. But what you should have done is to see the warrant. Sorry
they need a warrant
Yes. Depends upon the circumstances, for example, if the individual entered the residence to avoid apprehension and the police witnessed the act then they do not need a search warrant.
To come into a home the police need a search warrant to search. Without the warrant the evidence is not admissible in court. It would be an illegal search.