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 several great graphs of the data and details regarding the research and findings can be found at the link below. If you are short on time, the graphs of their results are near the end of the article.
Comparison of the M-Vac® Wet‐Vacuum‐Based Collection Method to a Wet‐Swabbing Method for DNA Recovery on Diluted Bloodstained Substrates - https://doi.org/10.1111/1556-4029.14508
The NIH (National Institutes of Health) has also published this study on their website:
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