The X-Files is one of the most popular and successful sci-fi shows in TV history and it took a cop show format and merged it with sci-fi. The cop show format makes for a sturdy and easily understood framework for a TV show and there have been enough shows and movies about cops and/or government agents investigating sci-fi/fantasy elements that it's something audiences can engage with very easily if you get it right.They might be making the same mistake I've seen before, trying to take a cop/lawyer/doctor show format and translate it to sci fi or fantasy setting. Cop, lawyer and doctor shows work because they have rules that make sense in the real world, and that the audience can identify with. But try to create sci fi medical procedures or fantasy police procedures, and you sever that connection.
But they followed FBI rules (or adaptations thereof), not sci fi rules. The problem arises when there are sci laws to follow - or fantasy laws - unless they are very cleverly thought through. I guess with enough work, you can come up with a new legal system that deals with witches, trolls and elves. If that's what RDM has in mind, then the results could be fascinating.