Before Return

Hi,
 
I want to make a call to a static method before each return of a method of
an existing class - at the moment Im not too fussed about dealing with
exceptions.
I can find the return instructions easy enough and insert my instructions -
but what Im not sure about is how to "re-setup" everything for the return
that follows.
Has anyone done this before and have any pointers?
 
Many thanks,
 
Dave


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