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.
Allegiant Airlines (G4) allows 1 carry-on small personal item - purse, briefcase, or backpack - fee free - and one carry-on bag - subject to an applicable fee. The carry-on should not exceed the following size and weight restrictions: 9 x 14 x 22 inches (22.9 x 35.6 x 55.9 centimeters) including handles and wheels.