In case you dont know, today the Supreme Court ruled that you dont have the rights of the 5th Amendment (the right to not self-incriminate) when you're detained by the police. If they ask you a question and you dont answer, it could be used as evidence of your guilt in court. You either have to invoke it or wait until they arrest you and give your the Miranda warning.
So, basically, the Supreme Court said that the 5th Amendment is no longer a right you have. You have ask for it by speaking certain words (like you're casting a spell or something), or wait until the police generously give it to you.
Now, in case you're wondering who's responsible for helping to destroy your Constitutional right to remain silent... all the judges that ruled for it (Roberts, Scalia, Kennedy, Thomas, and Alito) were appointed by Republicans, and all those who ruled against it (Ginsburg, Breyer, Sotomayor, and Kagan) were appointed by Democrats. Remember that next time you hear a Republican talk about how much they want to preserve the Constitution.