Investigators may have told you that the evidence against you is overwhelming. They may have fingerprints, shoe prints, bloodstains or DNA that supposedly links you to the crime. They may tell you these things -- even show you a weapon or a lab report -- to convince you to confess or reveal more information about the alleged crime.
However, this isn't TV. Before any of that evidence appears before a jury, it must go through its own trial of sorts. You may be relieved to know that every piece of evidence police claim to have against you may not appear before a jury. There are rules investigators and prosecutors must follow concerning evidence, and these rules are to protect your rights.