Prepare for security screening, not just your carry-on items but your check-in luggage and your person as well.
Keep your luggage and personal belongings with you at all time ( otherwise you might risk loosing it ).

Any metal item such as buttons, zippers, hair accessories etc. can set off sensitive detectors ( and they will run away with all your loose items ).

Some airports are equipped with "sniffer" scanners. These devices check for chemical and compound resides.