or not there is a case with that. and 15 minutes for a door to be propped open, no, worst case scenario will a kid sneak in? >>neil: we don't know whether it was propped open that long or how itas propped open. but ladies, i thank you both. and now to mike tobin in colorado and latest on the investigation right now. mike? >>reporter: background checks for people looking to buy guns in colorado are now up over 40 percent. the denver post reported instructor whose give less sons you need before you get a concealed carry permit have renewed interest. we set a camera by a local gun store and the owner said handguns and ak-47's are hopping off the shelf. the customers are citing two motivation: one is personal protection. the other is a desire to buy guns before new restrictions go if place spawned by this massacre.