A rifle can be disassembled in relatively small components, and re-assembled in minutes. You'd have to do a pretty invasive and thorough search to detect it - a

A rifle can be disassembled in relatively small components, and re-assembled in minutes. You'd have to do a pretty invasive and thorough search to detect it - and still, the criminal could just keep it in their car, which is not checked, and bring it in 10 minutes before the time, assemble it and do the deed.