The eyelids and surrounding skin will be swabbed with disinfectant. After the studies, the children's blistered skin was removed with scissors and swabbed with peroxide. The injected area was also swabbed with PEG to maximize light penetration. Lister found that the solution swabbed on wounds remarkably reduced the incidence of gangrene. On June 17, 2010 the Chicago Tribune swabbed the Cup for germs. The arm of the condemned person is swabbed with alcohol before the cannula is inserted. Finally, the surface was swabbed with nitric acid to burn off any residual organic matter. In 2003, the FBI swabbed Lombardo for DNA.