It's inevitable that Frank and Erin will continue to butt heads over their respective jobs.
Frank sees the DA's office as an adversary, if not an outright enemy, of the police.
And with so many Reagans in the police department, any perceived attack on the police department will seem personal to him.
On Blue Bloods Season 10 Episode 2, Frank and Erin clashed when Frank learned that the DA's office had a list of cops who it would not allow to testify.
Frank went to war, determined to get rid of the blacklist -- and he was right to do so.
Garrett didn't understand why Frank was choosing this hill to die on. By refusing to cooperate with the DA's office, Frank could put dangerous criminals back on the streets.
Garrett was right in a way. Frank's methods were extreme. But Frank's anger was understandable.
The blacklist was a policy that made sense on the surface. If a cop was an unreliable witness, then allowing that cop to testify made little sense.
But as Frank learned when he asked Erin about it, there was no set protocol for determining when a cop belonged on the bad witness list and no appeals process.
An arbitrary system with no means of appeal was a recipe for disaster. Not only could good cops get punished for a mistake or a misunderstanding, but a dishonest DA could easily use the list to settle personal scores with cops by banning them from testifying.
Frank: Someone please tell me how this predator is going to go free.
Garett: They have a naughty list. The DA has a list of officers which might be a credibility risk.
Frank: I thought it was my job to evaluate the fitness of my officers.
Frank felt the blacklist also encroached on his authority to discipline cops as he saw fit.
In a way, it did, but the more important issue was that bad guys could be put back on the street because the DA's office randomly decided not to let a cop testify against them.
Of course, the DA would ideally have a stronger case that didn't just rely on the testimony of one police officer, but the reality is that DAs don't always get ideal cases and have to make do with what they do have.
But denying cops the right to testify in any case because a defense attorney could poke holes in their credibility doesn't seem like a good policy.
Instead, why not evaluate on a case-by-case basis whether or not any witness -- including a police officer -- is a reliable enough witness to take the stand?
Of course, that wasn't the crux of this issue for Frank. The problem was that he expects Erin to be loyal to the family first and her job second, but she can't do that if she plans to keep her job.
Erin was right that she couldn't tell the DA what to do and could only make suggestions.
But she and Frank could have brainstormed together how best to persuade the DA to give up this ridiculous policy if they both hadn't been so damn stubborn.
Frank's solution may have convinced Erin to stand up to her boss, but I doubt it will win her any points at work.
Her boss may wonder why she lets Frank push her around and may want her to retaliate against Frank's ADA blacklist.
\Surely there had to be a better solution than this.
Jamie and Eddie also dealt with divided loyalties in a way.
Eddie thought Jamie should have demanded their sergeant give her the decoy assignment instead of him.
That was ridiculous.
If Jamie starts pulling strings for Eddie and putting his relationship ahead of his boss' orders, that will spell the end of his career.
Jamie: Are you still pissed that I got the decoy op instead of you?
Jamie: Good. Cause neither of us had a choice. We're cops. We take orders. That's always how it's gonna be. That's the job.
Eddie: All I'm saying is as your former partner, don't play the hero.
As with Erin and Frank, though, the real issue wasn't what Eddie initially complained about. Sure, she wants to be seen as equally tough to male cops -- and she should.
But beneath her carrying on about Jamie being overprotective was her fear that Jamie could be hurt or killed if he was the one to take this assignment.
I called it as soon as she picked a fight with Jamie.
She knew the assignment was dangerous, so she had to be scared for him no matter how much she insisted she wanted the assignment for herself.
And she was right to be worried, of course. That was some fight Jamie and the suspect had.
I've seen a ton of cop chases on crime dramas, but never one quite like this. Jamie had to drive and fight off a guy with a gun at the same time. He could have just as easily died in a fiery crash than at the suspect's hands.
Thankfully, Eddie backed him up without waiting to be asked, so that didn't happen.
Her response to Jamie asking why she was following him was perfect and reminded me of why I love Jamko so much.
They may fight, but they always have each other's backs and their banter is as much fun as their serious conversations.
Every once in a while, Danny and Maria have to rely on a criminal to help them solve their case.
At least this time it wasn't a criminal that was actively against Danny, and as a bonus, Vincent had nothing to do with Linda's death.
Vincent was a pretty likable guy if you overlooked the fact that he was a major player in the mob.
Predictably, though, he double-crossed Danny and Maria when they were trying to get Angelica to agree to testify.
What did they expect? The guy is a mob boss, and there's not much room for snitching in mob culture.
You're a typical cop. Get the collar, doesn't matter what kind of damage you do.Vincent
Vincent's chastising Danny for caring more about closing the case than what it would do to Angelica to testify was the most interesting part of this story.
His comments could have applied to several people -- especially Frank, who was willing to sacrifice his relationship with Erin and the police department's good name to score points against the DA's office.
Your turn, Blue Bloods fanatics.
Who was right: Frank, Erin, or neither of them?
Was Jamie taking too many risks in his decoy operation?
And do you like it when Danny teams up with criminals to solve crimes?
Weigh in below, and don't forget you can always watch Blue Bloods online if you missed anything.
Blue Bloods airs on CBS on Fridays at 10 PM EST/PST.
Jack Ori is a senior staff writer for TV Fanatic. Follow him on Twitter.