Last season it was a group of guys working together but they didn't know the exact number of the group or who was in it. Plus Jordan Chase was smart, rich, and had bodyguards/lawyers/etc. to hide behind. It made sense that Miami Metro had a hard time getting to him even when they knew that it was him. Travis is just some dorky guy running around killing people. They know exactly who he is and what he looks like but are just too incompetent to catch him apparently. The whole "Doomsday Adam" thing was dumb by the way. Oh hey look we found the blog of a KNOWN SERIAL KILLER but let's not shut it down or anything. He probably won't recruit some nutjob reading his posts or anything like that!
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-Merc