Under glaring laboratory lights, a research assistant extends his forearm and carefully inverts a mesh-topped container onto his skin to allow a wriggling mass of bed bugs to feed on his blood, all in the name of science.

Long-loathed as itchy household pests, the blood-sucking insects have revealed a darker, more intriguing potential as Malaysian scientists have discovered they can be turned into unlikely crime-busting allies.

A team from the Science University of Malaysia (USM) in northern Penang has found that tropical bed bugs can retain DNA from human prey for up to 45 days after snacking on an unwary victim.

This makes the tiny critters, who love to lurk in headboard cracks, mattress seams and pillow covers, ideal evidence resources when it comes to pinpointing suspects at crime s

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