As I mentioned before, converting the store vacuum cleaner into a HEPA-vac doesn't mean that the mold has been properly removed. It's important to note that even with a HEPA vacuum, you'll never be able to get rid of all the mold spores from the carpet. Most of these contractors have been trained to apply disinfectants and use the HEPA vacuum to remove visible molds. In a living space, mold correctors are usually standing and mold grows on flat surfaces, such as drywall, but in a small space, the subfloor may have nails that prevent the accessory from reaching the wood.
After going through my own nightmare with mold, it prompted me to become a certified mold inspector with the goal of helping others avoid extreme situations.