I'm really bored with cop shows where, someone arrests someone, and then a lawyer walks into a room unannounced and says they are leaving. In this case, after the evidence was said to be the old evidence, Dexter walked out because some people without the authority said so basically. She didn't have to let the other guy into the interview room, nor did she have to do it on her own unofficially. IE she could have taken it to another cop to arrest and interview.
Likewise, this is a guy she suspects and others did as well of being a mass murderer and a forensics expert, planting some old evidence would be exactly what you'd expect from him. The whole thing felt cheap and rubbish, likewise when they "found" Doakes supplies in a boathouse and again despite their main suspect being a forensics expert, did nothing.
Even worse, at the end she went with no back up, she's a freaking boss, she could have called the entire department down on top of him, but went on her own. Then even worse, she walked into a dead end... and didn't watch the only entrance at all, so painful. I also can't get over what a tranny/boy Deb looked like in the dress at the end... which she hugged the woman she just murdered, then went back to a party full of cops and the dress didn't have blood on it.. magic.
Similar thing(in terms of the arrest) happened in Arrow, main guy gets arrested, is being interogated, and the parents just invite themselves in and order the cops around.... happens almost constantly in Castle... guy arrested, guy being interviewed, lawyer walks in and says "we're leaving" and they ALWAYS let them. Lawyers can tell their client to shut up, they can't order cops around and tell their client to just walk out of a police station when they are under arrest. Stupid little things like that wind me up with these shows.
Crap episode, I've really enjoyed parts of Dexter, but lately he's simply become a murderer, I always hated the dark passenger nonsense, but Deb choosing to murder to protect him is just daft. There is no, he's a murdered..... but he's making the world a better place so I can root for him... he's just a ****, and Deb's always been a ****, and the way he gets away with murders is getting ever more ridiculous.