There is a difference between 'voluntarily' going in for questioning and being brought in as a suspect. As a suspect, you still have the right to have a lawyer with you. If they want you to be a witness, you should still lawyer up...but either way, you have the right to refuse to go. Only exception is if you are under arrest.From what i understand, it all depends on what state you are in. I dont think you can refuse to go in for questioning. If you do, they cna drag you down to the station under the excuse that you are a witness and they can hold you for 48 hours an dthere sint shit you can do about it.
48 hours may not sound like much but when you are a law abiding citizen who has never been inside of a cell, 48 hours seems like an eternity!! Add in the fact that you can be inside a cell with 15 blood gang memebers who may decide that they like your jewelery and clothes. (personal experience! Locked up for 14 hours because of some BS that they threw out and let me go at 4AM)
Also, the fifth amendment refers to not incriminating yourself--DO NOT SAY "I PLEAD THE FIFTH" EVER!!!! Just say that you will not be answering any questions unless you have a lawyer representing you. Pleading the fifth means that you are hiding something and they will come after you even harder...
"No person shall be held to answer for a capital, or otherwise infamous crime, unless on a presentment or indictment of a Grand Jury, except in cases arising in the land or naval forces, or in the Militia, when in actual service in time of War or public danger; nor shall any person be subject for the same offense to be twice put in jeopardy of life or limb; nor shall be compelled in any criminal case to be a witness against himself, nor be deprived of life, liberty, or property, without due process of law; nor shall private property be taken for public use, without just compensation"