Recreational Marijuana States. Four states, including Alaska, Oregon, Colorado, and Washington, as well as Washington D.C. have passed ballots legalizing recreational marijuana. The amount you can possess at one time, however, varies between the states.
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.
Answer Wiki. The limit is not actually on ounces of liquid, but on the capacity of bottles you bring on the plane that contain liquid. And the amount you are allowed depends on the country. A typical limit is 3.4 ounces (100 millimeters) but check online with your airline/airport, and do it for every country you are going to visit.