As of now, 20 states have legalized marijuana for medical purposes, and voters in Colorado and Washington have approved marijuana for recreational use. About a dozen more states are expected to legalize marijuana in some form over the next several years.
As of January 31, 2014, passengers traveling internationally into the U.S. and connecting to another flight are allowed to have in their carry-on baggage liquids in excess of 3.4 ounces (100 mL) that were purchased as duty-free merchandise.
Carry-on bags are subject to size and weight limits by airlines. Since what we bring in a carry-on is important and we don't want to be separated from those items, it's essential to adhere to your airline's requirements for the size and weight of bags you attempt to board with. Most carry-ons sold today measure 22 x 14 x 9 inches. As a general rule, U.S. airlines permit luggage that measures a total of 45 linear inches (115 centimeters), which is the combined length, width, and depth of the bag. This measurement includes handles and wheels.