Outside, the first officer to encounter Holmes -- who was still dressed in body armor, a helmet and a gas mask as he stood near his car -- described him as unnaturally relaxed.

CNN: STORY HIGHLIGHTS

There is no drug that is going to shed trustworthy light on Holmes' state of mind last year when, police say, he donned a gas mask as well as full body armor and grabbed a rifle, a pump-action 12-gauge shotgun and at least one .40-caliber semiautomatic pistol to launch a heinous attack.

CNN: 'Truth serum' won't reveal mind of James Holmes