It is true. Mold is everywhere and anyone who owns a home owns one with mold inside and out.
There is a 100% chance that the home you live in and the one that you buy in the future has mold in it.
This is what the Minnesota Department of Health has to say about mold testing:
“Poor reason for testing #1 “To find out if there is mold”
A complex mixture of mold particles normally exists in all occupied indoor environments. If appropriate testing is done, it is expected that molds will be found.
There is, however, an important distinction between the normal presence of mold particles, versus mold growth and accumulation indoors.
Unfortunately, even when it is done well, testing may not be able to distinguish between “normal” and “problem” conditions and it may even give misleading results.”
To lessen mold growth in your home, seal up any leaks, dry everything out. Clean or remove moldy surfaces. The Minnesota Department of Health website has information about how to clean up mold using bleach and water.