If you get arrested protesting, when you make your call, do NOT say something like "I got caught." Don't say anything about what you were doing. Say “I was arrested & need you to come get me." You’re recorded constantly during the arrest, in the car, every call or conversation until you walk out.
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Have YOU ever had a negative interaction with police?
I have.
But I guess you know more than an attorney 🙄
See Salinas v. Texas
https://www.law.cornell.edu/supremecourt/text/12-246
The OP was talking about if picked up while protesting.
Pleading the 5th during a trial whether a witness or the defendant is practically a confession without admission.
We are both talking about when you are first arrested.
It is important to positively assert your fifth amendment rights. Simply staying mute is not enough