The explanation in the article is fairly well done. One thing I can't help but think whenever there are more involved processes for catching someone though, is

The explanation in the article is fairly well done. One thing I can't help but think whenever there are more involved processes for catching someone though, is that we'll never know if that was the actual method used. For a large enough case, they could utilize some other, more secretive method, and then parallel construct this (believable) one, with the benefit of already knowing the final answer. Not something I'm saying _happened_ here, but certainly something I think everyone should keep in mind when they read these types of cases.