USPS Restricted Matter - Intoxicating Liquors
http://pe.usps.gov/text/pub52/pub52c4_005.htm#ep290063

Fed Ex Dangerous Goods policy
http://www.fedex.com/us/quick_help/s...pecServpolicy:

UPS Hazardous Materials Service Definition
http://www.ups.com/content/us/en/res...?WT.svl=SubNav

DHL Dangerous Goods policy
http://www.dhl.com/publish/g0/en/inf...oods.high.html