a very tricky string extraction

[Ed Reed]

This is an interesting problem that I hope someone can help me with. I
have a varchar field that contains data like this,
 
01/01/05 SG Reviewed this
12/15/03 DSD Reviewed that 
10/24/02 EWW Worked on that and tested this then stop to do something
else
05/02/01 AW Did something
08/31/98 DSD Tested this
07/22/97 EWW Worked on that and did something 
 
I need a Select statement that returns the Date for the first occurance
of the 'Tested this' substring
 
So far what I've come up with doesn't quite get what I need and it's
already pretty hairy. I wonder if there's a more elegant way that I'm
unaware of.
 
Thanks