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no he needs a search warrant
They must provide a judge with probable cause to do a search.
not if you let him search it
If the cop has a warrant or if he thinks you stole something or if the cop thinks you have a weapon in a place you are not suppose to have the weapon.
Only if they don't have probable cause.
yes, but only after they arrest you
YES, BUT ONLY WITH YOUR CONSENT
Absolutely, if the police suspect criminal behaviour, they can get a search warrant and turn the place upside down and inside out!
They regularly do when you cross the border. If you give them probable cause during a traffic stop, they will search. How ridiculous would it be for a cop to wake the judge to sign a warrant if the cop thought you had a stash under your seat?
As is often the case with analyzing the legality of an action taken by a cop, whether the cop can "just open your door" depends on the specific circumstances. For example, a cop can open your door when the cop has observed a felony in progress by seeing it through a window. Or when the cop is in hot pursuit of someone the cop has observed entering the dwelling. Otherwise, the general rule is that the cop must have a warrant before entering a dwelling without permission, and even with a warrant the cop usually must knock first and request admission (although not if the cop has a "no knock" warrant).
First he will have to show his I.D card, second he must have a proper warrant to search your house, if all this is not there he can stay out.
i need to know what a cop needs to know in order to get a search warrent