Especially for "garden" level properties or properties where windows haven't been maintained very well (chalking, compromised seals, etc.). Better safe than sorry.
I have used & recommended these folks with excellent results: Mold Busters (415) 731-6653
Mold can be found on surfaces and in the air. Make sure your mold inspector does sampling in every room, harmful molds can travel throughout the property and aren't always easy to see or smell.
Best of luck!