The FBI compared the M-Vac® wet-vacuum-based collection method to a wet-swabbing method on a variety of surfaces. In July 2020, they published some of their research. Twenty-two substrates, 2 non-porous and 20 porous, were evaluated including household items, construction materials and automotive items. The full article along with graphs of the data and details regarding the research and findings can be found at the link below.
1 McLamb JM, Adams LD, Kavlick MF. Comparison of the M‐Vac® Wet‐Vacuum‐Based Collection Method to a Wet‐Swabbing Method for DNA Recovery on Diluted Bloodstained Substrates. J Forensic Sci 2020; https://doi.org/10.1111/1556-4029.14508