The Absolute Least Amount To Go On

The investigators found no evidence of foul play

Just a pile of ashes in the ash tray

Which was odd in and of itself, but not evidence

Of anything other than someone's bad day
And the remains, on the surface
Of a few Cuban cigars

Still, the Inspector insisted on putting them in a bag
With the explicit details written on a tag
For analysis, you know, back at the lab 
Along with a broken glass and a dirty rag
The last two being obvious, the other, just curious
'cause you never know what'll put a murderer behind bars