JMO
I know DNA doesn't necessarily solve a case but I do recall seeing cases where, when results were received with a match, they announced it. There was a case here that happened not too long ago, the suspect is in jail and awaiting trial for the rape & murder of a 7yr old little girl - Gabbi Doolin and once they had the DNA back and it matched they announced it. As far as the time-frame for the DNA testing, I don't know if the time it takes can depend on what kind of DNA sample they get, but in Gabbi's case - she was murdered on Nov 14, 2015, iirc they obtained DNA from the guy the following day and while I'm not sure of the exact day they received the results back I know there was one article dated Nov 20 2015 that stated the DNA they'd taken from him matched the DNA they had found.
http://www.wave3.com/story/30569836/arrest-made-in-allen-co-girls-homicide
I know DNA doesn't necessarily solve a case but I do recall seeing cases where, when results were received with a match, they announced it. There was a case here that happened not too long ago, the suspect is in jail and awaiting trial for the rape & murder of a 7yr old little girl - Gabbi Doolin and once they had the DNA back and it matched they announced it. As far as the time-frame for the DNA testing, I don't know if the time it takes can depend on what kind of DNA sample they get, but in Gabbi's case - she was murdered on Nov 14, 2015, iirc they obtained DNA from the guy the following day and while I'm not sure of the exact day they received the results back I know there was one article dated Nov 20 2015 that stated the DNA they'd taken from him matched the DNA they had found.
http://www.wave3.com/story/30569836/arrest-made-in-allen-co-girls-homicide