Kevin Federline has doubled security at his home now that Britney’s out of the hospital. He’s seriously pissed that she was released so soon and fears she’ll make a run at the boys like she did in February 2007, according to OK! Magazine:

“The boys are safe for now,” the source reveals to OK!. “But Kevin feels Britney is clearly deranged, and there’s no telling what she’ll do. After all, this is a woman who two days ago barricaded herself in her bedroom with her youngest child for three hours!” Adds the insider, “You can’t get mentally well in a hospital after 36 hours.”

A reliable source for People revealed today that Britney’s drug test was negative for drugs and alcohol echoing early reports that her episode was mental:

“She tested clean,” the source says. “This lady is as clean as clean can be, and has been for some time.”