National Genetic Directive
The National Genetic Directive was passed in 2010, requiring every citizen of the United States to have their genetic code sequenced and logged into a government supercomputer database. Most people submitted willingly, while others were forced by law enforcement to comply. While there are still likely certain rogue individuals hiding in foreign countries, in extremely rural areas, or who have managed to fake their deaths and/or take on an assumed identity, by and large everyone has gone through with this.
The information obtained through the NGD was promised to be kept private, and was only to be used (1) to provide evidence in the event of a criminal investigation, (2) to assist in locating missing persons, (3) to assist the CDC in preventing and controlling diseases, and more controversially (4) to assist research into chemical and biological weapon defense.
They players have had their genetic code sequenced, or else have SOMEHOW faked this information. Which is not advised, but I’ll entertain the thought. It is up to the players whether they complied willingly or were forced.