Your likely referring to the March 14, 2000 USCIS memorandum on dual intent issued by Michael Cronin. The topic is covered Chapter 23 of the Adjudicator's Field Manual that can accessed at www.uscis.gov.
This is the official word. If this doesn't answer your question ... you should meet with an attorney:
PROFESSOR OF IMMIGRATION LAW for over 10 years -- This blog posting is offered for informational purposes only. It does not constitute an attorney-client relationship.