Flight Security Specialist Question:

Duty-free liquids, such as perfume or alcohol, are permitted in excess of 3.4 ounces as long as they were purchased at a duty-free shop and placed in special tamper-evident bags. Liquids not in these bags must be stowed in your checked suitcase if you have more than 3.4 ounces. Be sure to retain your receipt for the item, as you must be able to prove that you purchased it within the previous 48 hours.