This is a disgusting development in the case. No-knock raids need to be heavily restricted for this and other reasons.
Radley Balko from Cato has been working on the subject of no-knock raids. His exposure of the history and rights-squashing consequences, including homicide, are available at:
http://www.cato.org/research/criminal-justice/police.html This page gives links to his articles. Look midway down the page for:
http://www.cato.org/pub_display.php?pub_id=6651 "Wrong Door"
http://www.cato.org/pub_display.php?pub_id=6344 "No Swat"
The information is astounding. The Atlanta incident isn't even close to the first no-knock raid with a shocking outcome.