The Transportation Security Administration (TSA) administrator Robert Neffenger admitted recently that only three US airports require employees to go through a security check before entering ‘secured’ areas of the airport. Neffenger made the confession to lawmakers at a Senate Commerce Committee hearing on TSA security.

Atlanta, Miami and Orlando’s airports are the only three to require employee security screenings, Judicial Watch said. Senators reached a deal to bolster travel security in the wake of the terrorist attacks in Brussels, with measures that include doubling the number of TSA security teams with bomb-sniffing dogs at domestic airports. Other measures would also bolster the vetting of airport employees and add security to baggage claim areas.

Neffenger’s admission comes on the heels of several incidents involving gun and drug-smuggling operations by airline employees at major airports, including airports in Atlanta, New York and San Francisco. In March, it was reported that in 2015, the Department of Homeland Security had identified over 70 employees at nearly 40 airports across the country who have been flagged for possible ties to terrorism. However, TSA officials have said those employees are not necessarily involved in terrorism.