Here's why I'm boasting about your legal knowledge could backfire with the police. The cop doesn't care about your legal knowledge. He doesn't care if you think you're Perry Mason. You should be polite and respectful and wait for the police officer to ask you things so that you can tell him, "I don't answer questions without a lawyer." You don't need to boast about your legal knowledge to use your legal knowledge. And if you've got legal knowledge of your constitutional rights, you should know better than saying anything at a traffic stop. The fact that you have legal knowledge should be shown by your actions, not your words.