Yes but..
After they've produced id to indentify themselves....queued to get to the check-in desk.....produced their passports and tickets for no seat in particular......queued for the security check.....removed jacket, shoes, belt, keys, coins, jewellery,mobile, laptop...opened all hand-luggage for scrutiny passed the check...queued for boarding.....unluckily get picked for another security check.....queue in jetway and in aisle until eventually getting a bad seat.........
Where would you like to insert a breathalyzer check?