No, once the call has been made, it is presumed that the police have the right to enter a residence or business establishment and if certain circumstances exist, they may search said property and/or persons. If the police find illegal substances and/or items during a 911 call they can be seized and person(s) at the residence can be arrested.
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.
Probable cause.
They must provide a judge with probable cause to do a search.
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. The occupant/resident need not be present at the time the warrant is executed.
yes they have to have a paper signed by a judge
Yea
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.