When evaluating the statements about electronic surveillance, the following conclusions can be drawn:
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Police must obtain a warrant to monitor telephone calls. - True. In general, police need a warrant based on probable cause to monitor private communications, including telephone calls, unless an exception applies.
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Police may place surveillance devices on suspected criminals’ phones. - True. With a warrant, police can place surveillance devices on phones belonging to suspected criminals, provided they follow legal procedures.
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Police can plant viruses on smartphones of suspected drug runners. - False/Depends. This is a more complex issue and often requires a warrant. The legality can be determined by various factors including jurisdiction and the specifics of the law.
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Private citizens can monitor other people’s telephone calls. - False. In most jurisdictions, monitoring someone else's phone calls without consent is illegal and can lead to criminal charges.
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Private citizens can record their own telephone calls in most states. - True. Many states allow private citizens to record their own telephone calls, though some require the consent of all parties involved.
Thus, the true statements are the first, second, and fifth options.