Not anymore.
Police/Governments can tap anyone as it desire only in case if you are a menace to the society or other things that make them want to tap your line.
as soon as they are interested in you......
No.
It's illegal to do that anywhere!
The police tap the phone of a suspected criminal even though they don't have a warrant.
In the US it requires a warrant to tap a phone line. But there are exceptions under the Patriot Act.
The police tap the phone of a suspected criminal without a warrant.
No you can not. Its the only mobile phone that you can not tap
Only if they have obtained a federal wiretap warrant from a federal judge.
no
A radar that the police use to detect stuff.