Give the customer the information from an unbiased source and let them make the call.
I like to quote and provide the EPA document on the subject.

Quote:

Is sampling for mold
needed? In most cases, if visible
mold growth is present, sampling
is unnecessary. Since no EPA or
other federal limits have been set
for mold or mold spores, sampling
cannot be used to check a
building’s compliance with federal
mold standards. Surface sampling
may be useful to determine if an
area has been adequately cleaned or remediated. Sampling
for mold should be conducted by professionals who have
specific experience in designing mold sampling protocols,
sampling methods, and interpreting results. Sample
analysis should follow analytical methods recommended by
the American Industrial Hygiene Association (AIHA), the
American Conference of Governmental Industrial Hygienists
(ACGIH), or other professional organizations.

http://www.epa.gov/mold/pdfs/moldguide.pdf

Keep in mind, testing and remidiation are two different animals.

__________________
Jim Luttrall
Mr. Inspector.net, Inc.
Allen, Texas 75002