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Only where probably cause exists.
If they have probable cause that a crime is taking place inside. No they still have to have a warrant.
I think they can walk the premises but i don't think they can enter your home without a warrant.
The police cannot enter onto private business property without the owner's permission in Arizona. They must obtain a warrant to do so, if they do not receive permission.
Yes
The police need a Search Warrant to enter a private residence in order to collect evidence unless they have reasonable cause.
Police can search a private home if they have a warrant to search a house. There may be some exceptions under the Patriot Act.
No.
If the Police or other authorities see you commiting the crime.
Yes they can search it
No it is not
Yes, there is no need for a warrant. The person can refuse to cooperate with the police if they so choose, in which case they might be taken into custody for interrogation at the police department.