From the NewScientist article Laforet linked above: > fake fingerprints can be created by imprinting copies in rubbery gels or silicone plastic, says Marcela E

From the NewScientist article Laforet linked above: > fake fingerprints can be created by imprinting copies in rubbery gels or silicone plastic, says Marcela Espinoza of the Institute of Police Science in Lausanne, Switzerland. Replace silicone with some other flesh-like material that's conductive.