nefarious actions in the future. >> what about some of the screenings, juliette, pilots go through schooling, they have screenings including mental health screenings, but what about for bus drivers or more importantly transit workers who operate train systems? what about them? >> well, there's different sets of clearances and credentials for different transportation systems. it will seem confusing to most people. there's something called twik, it's transit worker identification card for ports and transit. lots of states and localities have different systems in terms of identification and clearances. but no system is testing every person at every moment. and we just have to balance that against major urban transit systems that can't come grounding to a halt because you're checking everyone who works there or works around there. so it's just a constant balancing act that's never going