In 2013, the US Supreme Court ruled (in Salinas v. Texas) that in a police investigation a person must specifically invoke their Constitutional right to remain silent. Otherwise the very fact that they said nothing in response to questioning may be used against them later in court.
Here are two sentences I recommend all upstanding citizens memorize and occasionally practice saying in role play:
“Officer, I am invoking my right to remain silent. Please let me contact my lawyer now.”
This would be the final step in Ayoob’s five-point checklist. It should be repeated as often as necessary, word for word, until it has the desired effect.