How to detect if a file contains unicode characters ?

From: ieee std (ieeestd802_at_yahoo.com)
Date: 10/30/04 

Date: 29 Oct 2004 16:07:31 -0700

Folks:

Let's say I have thousand text files, some might contains unicode
character (double byte), is there a simple way to detect it ? Is there
a simple command in Unix (or a system call) for this ?

Thanks in advance.

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