FRE - admission of polygraph.
Deft opened the door to admission of polygraph by asserting coercion.
Not unduly prejudicial -- trial court fairly weighed.
https://www.ca10.uscourts.gov/opinions/15/15-2037.pdf
Since 2011. An occasional commonplacing of the U.S. Circuit Courts of Appeal.
Not written by a barrister. The name was thought up by a second-year American law student sitting in a coffeehouse in Manhattan. Neither an authoritative statement of the law nor legal advice.
Don't rely. Quick work.