Does Top Security Clearance include a polygraph examination?

no it's no polygraph test but they do research every person you put down......so it tells you to go back 10 years and every person you put on that list will be contacted either by phone or person....with a TS clearance...it most likely will be by person......so be careful who you put down....do not put your cousin who been in and out of jail his whole life.....just sayin.....and also credit is the number one reason people get denied and or loose their clearance......so make sure your credit is in order before applying