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A wet‐vacuum‐based collection method with the M‐Vac ®  was compared to a wet‐swabbing collection method by examining the recovery of diluted blood on 22 substrates of varying porosity. The wet‐vacuum method yielded more total nuclear DNA than wet‐swabbing on 18 porous substrates, recovering on average 12 times more DNA. However, both methods yielded comparable amounts of total DNA on two porous and two nonporous substrates. In no instance did wet‐swabbing significantly recover more DNA. The wet‐vacuum method also successfully collected additional DNA on previously swabbed substrates. Mitochondrial DNA yields were assessed, and outcomes were generally similar to the nuclear DNA outcomes described above. Results demonstrate that wet‐vacuuming may serve as an alternative collection method to swabbing on difficult porous substrates and could potentially recover additional DNA on previously swabbed substrates. However, swabbing remains the preferred collection method on substrates with visible stains and/or nonporous surfaces for reasons of convenience, simplicity, and lower cost relative to the wet‐vacuum method.

Comparison of the M‐Vac ® Wet‐Vacuum‐Based Collection Method to a Wet‐Swabbing Method for DNA Recovery on Diluted Bloodstained Substrates * † ‡