Drain wire is ALWAYS associated with a shield, and it's a bad design that increases SCIN, or shield current induced noise, because it causes irregularities in the shape of the shield.
If you have a drain wire or shield on a PC it's only connected to the MALE or WALL end, because the noise the shield picks up is connected further away from the system. If you connect a shield to both ends it's simply another ground wire, and it defeats the entire purpose of having SEPARATE ground and shield.