
Gunplay
After Green goes undercover to gather evidence on the gun dealers who murdered two detectives during a buy-and-bust, McCoy is able to connect the hit men to the attorney who paid them to avenge the death of his gun-running stepson at the hands of the same detectives during a similar buy-and-bust several years earlier.
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More from this season

S15 E1
Paradigm
An Iraqi immigrant who murders a former military policewoman in retaliation for torturing her brother at Abu Ghraib prison claims that she is covered as an enemy combatant under the terms of the Geneva Convention.

S15 E2
The Dead Wives Club
When a woman abandoned by her firefighter husband for his partner's widow is threatened with also losing custody of her children, she murders her romantic rival, claiming that 9/11 post-traumatic stress syndrome prompted her actions.

S15 E3
The Brotherhood
When a prison gang puts out a contract on a Sing Sing corrections officer and his family, assigning the job to a newly released ex-con, the terrified officer pleads preemptive self-defense after he's brought to trial for the parolee's murder. As the trial proceeds, the gang attempts to affect the outcome of the case by sending a death threat to the presiding judge, who refuses to be intimidated. Shortly after the conclusion of the trial, McCoy discovers that the defendant's fears about the power and the reach of the gang were well-placed.

S15 E4
Coming Down Hard
McCoy goes after the C.E.O. of a pharmaceutical company who knowingly commissioned further clinical trials on a drug to extend its patent protection yielding millions of dollars of profit without disclosing that previous clinical studies had demonstrated that the drug created a high risk of suicide in its users.