http://usnews.msnbc.msn.com/_news/2...ate-school?lite

Weapon purchases started in May
In addition to two canisters, perhaps holding teargas, four weapons were found at the scene, Oates said.

Two were .40-caliber handguns, made by Glock. At least one of those was used, the police chief said. Holmes had purchased more than 3,000 rounds of .40-caliber ammunition, Oates said.
One shotgun, a Remington Model 870, one of the most popular models. Pump action, single barrel, 12 gauge, with 300 rounds.
And one Smith & Wesson AR-15 type rifle, .223 caliber, called by some an "assault rifle." These weapons can accommodate large ammunition clips, and Holmes had one "drum clip" that would have carried more than 100 rounds, Oates said. With that clip, he could have fired 50 to 60 rounds in a minute, even if the rifle was considered semi-automatic, not automatic, Oates said. He had 3,000 rounds of ammunition for this rifle.

Officials told NBC News that all four were purchased legally, beginning in May, from two national chain stores: Gander Mountain Guns and Bass Pro Shops.

Bass Pro Shops released a statement saying that employees at a Denver store followed all laws when they sold two weapons to Holmes. "We want to offer our deepest sympathies to the victims and their families," said Larry Whiteley, manager of communications for the company. "This is an unspeakable tragedy, and we join with all Americans in offering our prayerful support. Based on the records we have reviewed, personnel in our Denver store correctly and fully followed all Federal requirements with respect to the sale of one shotgun and one handgun to the individual identified in this incident. Background checks, as required by Federal law, were properly conducted, and he was approved. Again, our hearts go out to the victims and their families. We also offer our support and appreciation to the law enforcement and emergency response professionals and all others who responded to give aid to these innocent victims."

CNN spoke with the CEO of TacticalGear.com, which said it sold Holmes a Blackhawk urban assault vest for $107, along with a triple pistol magazine, an M16 magazine pouch and a silver knife.

The only previous police record for Holmes is a speeding ticket in October 2011, the chief said.

槍支本身是合法取得的，彈藥及配件大部分是網絡訂購的，至於防護裝備很多軍警用品或體育用品店都有賣.
至於炸藥原料及化學器具之類的，我想醫學院本身就是個神奇的地方.