Which of the following is true about electronic surveillance select all that apply is it police must obtain a warrant to monitor. Telephone calls. Police may play surveillance devices on suspected criminals phones police can plant viruses on smart phones of suspected drug runners or private citizens can monitor other peoples telephone calls or private citizens can record their own telephone calls and most states.

The following is true about electronic surveillance:

- Police must obtain a warrant to monitor telephone calls.
- Private citizens can record their own telephone calls in most states.