By Mark Strassmann
March 27, 2012 7:10 PM
On February 26th, the night Martin was killed, police questioned Zimmerman for five hours at police headquarters. The police report noted Zimmerman was "bleeding from the nose and the back of the head." [Karl: nosebleed, okay; broken nose, unlikely] [...] Police did not administer a drug and alcohol test or an immediate background check on Zimmerman, although they did both on Martin.
The next day, detectives re-enacted the shooting with Zimmerman at the scene. They also discovered Zimmerman had two prior arrests: one for assaulting a cop, the other for domestic abuse. For the next two weeks, lead investigator Chris Serino pursued a manslaughter charge against Zimmerman. Police interviewed at least six witnesses. But none of them saw how the confrontation began or the shooting that ended it. Public pressure grew. On March 12, police gave the case to State Attorney Norm Wolfinger. He told them they needed more evidence to arrest Zimmerman. [...]
What happened right after Trayvon Martin's shooting? - CBS News