Bedbugs often spark itchy scares around the world, but Malaysian scientists have discovered how the much-loathed creepy crawlies can be turned into unlikely crime-busting allies. A team from the Science University of Malaysia (USM) in northern Penang has found that tropical blood-sucking bed bugs can retain human DNA for up to 45 days after snacking on human prey. IMAGES AND SOUNDBITES ARRANGED IN SEQUENCES