Legal Question in Constitutional Law in California

Law enforcement can only intercept telephone and text messages with a warrant. To get a warrant, they must convince a judge both that you probably committed a specific offense and that monitoring your communications is likely to yield admissible evidence of your guilt. Even if a judge issues such a warrant, she will likely restrict the extent of the monitoring.

If the authorities manage to get such a warrant, any communication they intercept (except for certain legally privileged communications, such as those between you and your lawyer) can be used against you.