ok...the camera policy is dependent on the band policy. With U2 it was ok to bring in digital/film cameras as long as they weren't professional with detachable lens. Since your question is in reference to another concert and not U2. You better check with the Staples Center first. Not every band allows cameras at their shows. So its better not to assume. Also if you can somehow check with the band (via website and or management) youre seeing, see if you can find out if they allow cameras at their concerts. I know with the first show in april for U2 the venue staff was unaware that the band allowed cameras and they made everyone take back their cameras that day. However, the next day/show they corrected this and allowed cameras in.
Big problems with situations like this is that venue staff and band management have a communication problem (a big one) meaning whatever band policy is it doesnt get communicated to the venue staff/security. Basically, they don't talk to each other and venue staff has no clue as to what is going on. Sad but true.
Security is very very tight. No way you are gonna be able to get away with it if the band policy is no cameras. Even if you manage to sneak it in. The security inside is very tight, security all over the place. I was told by security there that they have hundreds of hidden cameras all over the place so if you take a picture you will probably get caught.
Just be cautious and do ur research. Check into it first before taking any camera in.