[theFIRMbss]

>Common sense tells you that nobody would leave a traceable weapon. They would leave another weapon. Also, the officer had to know that a security sweep was coming and the weapon would be discovered. This was not done on purpose

Unless they're tricky --
Leave a gun openly there,
at one location,

to draw attention
away from some other spot
where one's really hid . . .

A "high profile" hit
probably would include lots
of indirection.

[SALChamps03]

I don't disagree, except that I can't imagine leaving any weapon that can be traced back to you.