Per a Judge freind of mine and the ACLU- as soon as they read you your rights, you have only two things to say: “I want to speak to my/an attorney” and “Am I free to go?” (plus minor personal ID info, of course). Otherwise- STFU.
Note that the Police can lie to you. They can tell you they found your DNA and fingerprints at a scene where in reality they have not (more ethical police will frame these as “What would you say if we found you DNA at the scene?”) . They can say your freind ratted you out.
http://www.aclu.org/police/gen/14528res20040730.html
"*Think carefully about your words, movement, body language, and emotions.
Don’t get into an argument with the police.
Remember, anything you say or do can be used against you.
Keep your hands where the police can see them.
Don’t run. Don’t touch any police officer.
Don’t resist even if you believe you are innocent.
Don’t complain on the scene or tell the police they’re wrong or that you’re going to file a complaint.
Do not make any statements regarding the incident. Ask for a lawyer immediately upon your arrest.
Remember officers’ badge and patrol car numbers.
Write down everything you remember ASAP.
Try to find witnesses and their names and phone numbers.
…If you feel your rights have been violated, file a written complaint with police department’s internal affairs division or civilian complaint board.
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What you say to the police is always important. What you say can be used against you, and it can give the police an excuse to arrest you, especially if you bad-mouth a police officer.
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You must show your driver’s license and registration when stopped in a car. Otherwise, you don’t have to answer any questions if you are detained or arrested, with one important exception. The police may ask for your name if you have been properly detained, and you can be arrested in some states for refusing to give it. If you reasonably fear that your name is incriminating, you can claim the right to remain silent, which may be a defense in case you are arrested anyway.
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You don’t have to consent to any search of yourself, your car or your house. If you DO consent to a search, it can affect your rights later in court. If the police say they have a search warrant, ASK TO SEE IT.
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Do not interfere with, or obstruct the police – you can be arrested for it.
IF YOU ARE STOPPED FOR QUESTIONING
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It’s not a crime to refuse to answer questions, but refusing to answer can make the police suspicious about you. If you are asked to identify yourself, see paragraph 2 above.
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Police may “pat-down” your clothing if they suspect a concealed weapon. Don’t physically resist, but make it clear that you don’t consent to any further search.
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Ask if you are under arrest. If you are, you have a right to know why.
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IF YOU’RE ARRESTED OR TAKEN TO A POLICE STATION
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You have the right to remain silent and to talk to a lawyer before you talk to the police. Tell the police nothing except your name and address. Don’t give any explanations, excuses or stories. You can make your defense later, in court, based on what you and your lawyer decide is best.
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Ask to see a lawyer immediately. If you can’t pay for a lawyer, you have a right to a free one, and should ask the police how the lawyer can be contacted. Don’t say anything without a lawyer.
3…
5. Do not make any decisions in your case until you have talked with a lawyer.
IN YOUR HOME
…"*