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.
In sum, the 3-1-1 Rule states that you can carry as much liquid as can fit inside 3.4-ounce containers that fit inside one plastic quart-sized bag; however, you can carry as much liquid as you feel comfortable carrying in your checked bags as long as these liquids do not violate other TSA regulations that dictate what you can and cannot fly with in general.