Can you volunteer ? I know you can on TV not sure if that is real life - I’ve never understood the need for a search warrant at a crime scene but it doesn’t look like they had to here at the Closs home but I’ve read other cases where they had to get a warrant even when there was a dead body and 911 was calledIn the United States you need to show probable cause for a search warrant to obtain someone's DNA. That is, you need to prove to a judge that you have probable cause that you will retrieve evidence that a crime has been committed. You cannot just demand random people give their DNA over. Many states now require anyone charged with a felony, even if they are not convicted, provide a DNA sample for CODIS so the database is much larger and growing all the time.
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