House had mold..was cleaned with bleach and primed with Kilz...is this good enough?

[Adam Demchik]

Looking to purchase a rehab and the seller has already remediated a mold issue by using bleach and painting everything with Kilz. I am pretty sure this is not the correct method. The house had mold in the attic and in the bedrooms. I have no issues hiring out the mold remediation process but can I do it correctly if it has been painted with Kilz? Is there an air test I can perform? Thanks!