Federal and international authorities are reportedly backtracking after saying that newly disclosed evidence showed that no blood was found at the Spain apartment where a Florida woman vanished.Ana Maria Knezevich, 40, was last seen in Madrid, Spain, on Feb. 2 around 10 p.m., just 30 minutes after a man wearing a motorcycle helmet spray-painted surveillance cameras in her apartment building in the Salamanca quarter.According to the Miami Herald, lawyers for her husband, David Knezevich, are pushing back against the prosecution's case due to the alleged lack of forensic evidence found at the scene."There was no blood, no struggle ... no