They get a signed warrant from a judge to tap phones/cell phones. They have to prove to the judge that there is reasonable cause to do this before they can get the warrant. Under the Homeland Protection Act some of the protections against tapping phones are weaker than they use to be so it is easier to get the warrant.
you cant. doing so requires special equipment more advanced than a police scanner. police in some areas use cell phones over their radio for privacy issues. for example if police are busting a party for underage drinking, they use cell phones to communicate so that anyone who has a scanner cant warn everyone to run or not answer the door. police scanners use radio waves, cell phones are on a different frequency. cell phones now also use encryption.
The police and other law enforcement agencies can and do track or triangulate cell phone calls. There are some that try to get around this by buying prepaid disposable phones which make it very hard for the police to track. But triangulation of cell phone calls can be tracked to neighboring cell towers.
A search warrant is a different type of warrant, BUT with a specific phone tap warrant the police can listen in on your phone calls. Be aware however, that "cordless" and cell phones, operate on public radio frequencies assigned by the Federal Communications Commission. ANYONE, with the proper equipment to do so, can listen to these conversations.
Yes they can. All cell phone providers ensure that all Base Stations are 'enabled' to allow the Police/Inst Security Depts to listen in, and that too without any appreciable drop in quality of the phone call. Various countries have restrictions on listening with and without 'judicial' approval, but to answer your question--- YES.
Police use mobile phones for the same reason you do; for quick and easy communications with pretty much anyone. The exception to this is in the event of a major disaster that interrupts police and emergency services communications, cell phones are considered a backup for normal police communications. In non-emergency situations, cell phones are not a secure means of communications, and can be eavesdropped upon and used to locate the caller. As such, these are never an official means of first responder and emergency services communications.
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