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.
Store carry-on items in a clear bag. First, make sure that all of the non-essential liquids and gels that you intend to pack in your carry-on do not exceed 3.4 ounces (100 ml/g). If they do, purchase smaller sizes. Next, use a single clear, resealable 1-quart (1 L) bag to store them within your carry-on.