'The Ehrengraf Presumption' is free on Amazon US today. As Harry T noted up-thread, this one is also included in the short story collection 'Enough Rope'.
The Ehrengraf Presumption
“The Ehrengraf Presumption. Any client of Martin H. Ehrengraf is presumed by Ehrengraf to be innocent, which presumption is invariably confirmed in due course, the preconceptions of the client himself notwithstanding.”
Words to live by…