Pretty sure ‘valid’ was about registration; a valid entry in the database not a aspersion on the DNA. In the movie they state they’re looking for someone who is

Pretty sure ‘valid’ was about registration; a valid entry in the database not a aspersion on the DNA. In the movie they state they’re looking for someone who is smart enough to have avoid registering all of these years. To avoid registration Vincent would have had to take even worse jobs than otherwise would have been afforded to him, similar to undocumented immigrants in the US today.