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Holmes also bought two Glock handguns, a shotgun and an AR-15 rifle, along with 6,295 rounds of ammunition, targets, body armor and chemicals, prosecutors said.
He dyed his hair bright orange, then bought a scope and non-firing dummy bullets on July 1, the visit and the new hair color documented in security video.
The description of Holmes after the attack, given by police detective Craig Appel, seemed to conflict with prosecutors' attempts to show Holmes as methodical, spending two months to assemble his arsenal.
The setup in Holmes' apartment had deadly potential, though.
As a police detective interviewed the suspect they'd picked up outside the theater, he started pretending the paper bags on his hands — meant to preserve gunshot residue — were puppets. The description came Tuesday as prosecutors try to show that Holmes should face a trial for the July 20 attack at a midnight showing of "The Dark Knight Rises." He faces more than 160 felony charges for allegedly killing 12 and injuring 70.
The former neuroscience graduate student tried to jam a staple into an electrical outlet. Prosecutors have yet to decide whether to seek the death penalty. Defense attorneys say Holmes is mentally ill and have said they might call witnesses who could discuss Holmes' mental health.
Parts of Holmes' carpet were soaked with gasoline and oil and ammonium chloride, a white powder, was poured onto the floor in strips, FBI bomb technician Garrett Gumbinner said."It would have ignited and the whole apartment would have exploded or caught fire," Gumbinner said.
He said the system had two other initiating systems.