Weather TSA is there or a contracted company. Federal law prevails. PLUS, any company that has the aitport security MUST follow all federal regulations and laws.
"On 20 February 2009, Northwest Airlines Flight 2 from Ninoy Aquino International Airport in Manila, the Philippines (using Boeing 747-400 equipment), experienced severe turbulence during landing at Narita International Airport (east of Tokyo, Japan). All 408 passengers and 14 crew members landed safely; however, 50 people were injured; around five were hospitalized. Currently the Japan Civil Aviation Bureau is investigating the incident."
Is there something wrong at Narita?