Christians, at what point does a debate become throwing your pearls before swine?

If you ever get arrested or are questioned by the police. Say nothing because if there is one group of people who will take your word of truth (sacred) words of truth(pearls) they will use those pearls against you no matter what you say. Make no oath; let your yah be yah and your nay be nay for anything else come of the evil one which incidentally is your own ego operating inside of you so that pride becomes your satan. Police will entrap you with your words no matter if you say yes or if you say no.