If they couldn't but guns and carry them around so easily then they wouldn't be such a threat.
http://news.google.com.au/nwshp?hl=en&tab=wn
"In the last 60 days, [Holmes] purchased four guns at local metro gun shops and through the internet, he purchased over 6,000 rounds of ammunition," said Mr Coates, who occasionally fought to control his emotion.
The ammunition includes more than 3,000 rounds bought for an assault rifle, 3,000 rounds for two Glock handguns and 300 rounds for a shotgun.
"Also through the internet, he purchased multiple magazines for the .223 calibre assault rifle, including one 100-round drum magazine, which was recovered from the scene," Mr Coates added.
"I'm told by experts that with that drum magazine, he could have gotten off 50 to 60 rounds... within one minute.
"And as far as we know, it was a pretty rapid pace of fire in that theatre.
"My understanding is all weapons he possessed, he possessed legally. All ammunition he possessed, he possessed legally."
New York mayor Michael Bloomberg, who has long argued for tighter restrictions on fire arms, is challenging the candidates to spell out their positions on gun control.
"Somebody's got to do something about this and this requires, particularly in a presidential year, the candidates for president of the United States to stand up and once for all and say, 'Yes, it's a tragedy'," he said.