A warrant requires probable cause. This would require evidence. Again, if its in your mind (like a password) you cannot be compelled by law to divulge.
For the privilege to apply, however, the government must try to compel a person to make a “testimonial” statement that would tend to incriminate him or her. When a person has a valid privilege against self-incrimination, nobody — not even a judge — can force the witness to give that information to the government.
And as we all know, fingerprints do not fall under 5th amendment protection.
Sure. But probable cause is necessary for you to open your trunk or your pda as well - 'plain sight' rules apply. If you get pulled over on a traffic stop, there is no probable cause, and no warrant would hold up... Unless they found illicit drugs for instance (by plain sight), whereupon, while you are sitting in jail, a warrant will be issued to search your home your car, and probably electronic information services and devices.
Again, if its in your mind (like a password) you cannot be compelled by law to divulge.
Right, which is why I said that nothing incriminating should be kept on an electronic device, anymore than it should be kept on a piece of paper.