Crash & Burn

Four robbers storm into a check-cashing outlet. They release tear gas grenades and rob the place. Nash, Joe, Harvey, and Evan respond to the silent alarm. Three robbers (who all turn out to be women) dump the cash into a getaway car (driven by another woman) and leave on foot. Harvey and Evan run into the getaway car, but let it go, not knowing that the robbers are women. Nash and Joe confront the fourth robber. Nash shoots him dead through the eye hole in his gas mask.
The dead robber is Adrian Beltran; stolen is 100,000 dollars. The MO (modus operandi) is similar to a North Beach robbery crew from four years ago, who are now all in prison. Nash suspects Anthony Warrick, who ratted out the original crew. But Warrick retains heavy-duty lawyer Denise, and Warrick is clean with no connection to the dead man. While Harvey and Evan surveil Warrick, another robbery goes off. A trace of the tear gas grenades leads to Bunker Bob, but he only identifies the dead Adrian Beltran.
A study of the

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S04E23 - Frisco Blues