Where Colorado law differs from some other places is that guns do not have to be registered and no permit or license is required to carry a weapon openly. Also, law enforcement is prohibited from building a database of gun purchases and owners.
Holmes bought 6,000 rounds of ammo online. Those purchases were also legal.
What's atypical according to the local news, is that 95% of guns used in violent crime are obtained illegally. What probably wasn't legal was the gas cannisters he used.
Holmes acted alone. This was not a spontaneous crime. It was well-planned. And no one knows his motivation.
Holmes was an honor student in college and a Ph.D. candidate in neuroscience at the University of Colorado in Aurora until last month when he withdrew. He booby-trapped his apartment, there are incendiary devices, chemicals and a central detonator inside. 5 apartment buildings were evacuated. Residents have been allowed back into 4 of them to retrieve belongings.
He bought a ticket to the movie, entered the theater through the front dressed in regular clothes, and then exited through the emergency door inside theater 9. He propped the door open and returned a few minutes later, decked out in riot gear, and released the gas canisters. He then opened fire, from the front of theater 9.
Before he asked for a lawyer, Holmes told police his apartment was booby-trapped and he had taken a Vicodin about 2 hours befoer the shooting.
Holmes father flew to Colorado this afternoon and was picked up at the airport by the FBI to answer questions about his son.
Colorado law enforcement is getting big praise. They were at the scene within 3 minutes. Local police were able to enter immediately, having been trained, rather than having to wait for a SWAT team as they did at the time of Columbine. They arrested the suspect by his car in the parking lot within minutes. He was still wearing his gas mask. When there weren't enough ambulances, police drove victims to the hospital themselves.
The hospitals were also well-equipped to deal with the victims. They went into triage mode.
President Obama gave a very moving speech. Romney also addressed the tragedy. While it wasn't a day for politics, Romney to me seemed wooden -- ill at ease -- reading from notes.
One thing I could have done without: a reading of celebrity athlete tweets about the tragedy.