As Wozs paranoid calculations wind down, his worldview, compounded by decades of police work, becomes clear.
Because theyre family, and family looks after its own.
Is the FBI compromised as well?

Credit: Peter Kramer/NBC
Duty calls, and Wozs hunches will have to wait.
As the cops drive up to the scene, the same suspicious car drives past again.
This time, the driver does more than circle: He shoots out the buildings windows before speeding away.
Woz is grazed its only a flesh wound, but its enough to have him seeing red.
He makes finding the shooter the teams No.
Harlee knows the distraction is only momentary, though, and shes still spooked by Wozs mistrust.
Apparently, thats not how these things work, however.
Woz oversaw four of the cases, but only one name strikes an alarm bell: Miguel Zepeda.
Could there by chance have been some impropriety regarding his teams investigation of that case?
(Spoiler: Duh.)
While Harlee rushes off to meet with Stahl, Woz commits some more suspicious activity.
On the video, Woz informs Harlee that Zepeda claims she framed him for murder.
She couldnt see a way out until he was arrested for grand theft auto.
But Zepeda didnt come after her: He came after Cristina.
The creep taunted Harlee with the knowledge that he could hurt her daughter at any time.
At the end of this sorry tale, Woz doesnt write a report or take young Harlee into custody.
Instead, he tells her to erase the paper trail.
Shortly thereafter, he handpicked her to join his detective squad.
We can only imagine what dirt he has on the other members of his unit.
This isntMinority Report, and cops cant imprison people for future crimes theymightcommit.
However, considering Zepedas history of abuse, Im interested to hear arguments that she was justified.
Woz: 10 out of 10, The Guiltiest
So far no redemptive factors here.
Woz played Harlees vulnerability for his own gain and sanctioned her very first step toward corruption.
Its a slippery slope from there, and hes the one supplying the grease.
NEXT:
While Woz is reviewing his past misdeeds, Harlee is making new ones.
Woz knows theres an informant in his unit, and she fears for her life.
Stahl is fed up, so he asks Chen to draw her gun and arrests Harlee on the spot.
Back at work, the cops finds out who their drive-by shooter is.
While casually pointing the shotgun in her direction, Woz questions Harlee again about their mole.
To throw him off, Harlee desperately suggests polygraphing everyone in their crew.
That willprobablynot go well for her.
On the other side of town, Tufo relieves Loman of his surveillance duty.
Tufo, Wozs man to the core, says cops catch thugs, period.
But when she shows up, its just the two of them.
Clearly, Wozs suspicions are solidifying.
Harlee thinks fast and intentionally burns herself on a tea kettle while Woz is setting up.
Pain makes the heart rate spike, throwing off the polygraph.
She takes the test, and seemingly satisfied with the readout, Woz lets her go.
But after she leaves, he flashes back to the tape from 10 years earlier.
Harlee exhibited the same tell when he asked her tonight if shes an informant.
Looks like our girl might have some explaining to do.
Final Guilt-O-Meter
Shes back to helping the FBI but only because prison was her other option.
Is he about to add murdering a fellow officer to his ever-growing list of sins?