This excerpt taken from the GPS 10-K filed Mar 28, 2005.
ALCOHOL AND DRUGS
Employees may not use, sell, possess, purchase or transfer illegal drugs on Company premises, in Company vehicles or during work hours. Alcohol consumption during work hours or on Company premises is prohibited. The only exception is that alcohol may be consumed by people of legal drinking age at Company-sponsored functions that are approved by a Senior Vice President or above.
Employees also must not be under the influence of illegal drugs or alcohol during work hours, regardless of when the drugs or alcohol were consumed. It is also a violation of this policy to sell, transfer or distribute personal prescription drugs on Company premises, in Company vehicles or during work hours.