The reasons why I am thinking that the memo may not be valid now:
Reason 1: The police commissioner Mr. MV KrishnaRao who issued that memo in 2002 is not working as Hyderabad commissioner now.
Reason 2: The current police commissioner might be having a different view and might be thinking arrest is the correct procedure on 498A cases.
Reason 3: Sofar there is no specific law to NOT to arrest.
So the memo which he passed in 2002 might be valid in his era but it may not be valid now as we have a different police commissioner in Hyderabad now.
All respected Advocates..... Please respond and provide your valuable inputs here. This is going to helpful lot many people. THANKS IN ADVANCE FOR EACH AND EVERY ONE.