What drug is Rosa's season 2 task force working to stop?

Rosa’s season-two task force is working to stop the drug Giggle Pig.

The storyline appears in “USPIS,” the eighth episode of Brooklyn Nine-Nine’s second season. Rosa leads an operation targeting Giggle Pig distribution and recruits Jake Peralta to help. Because the dealers use post offices and mailboxes, Jake and Charles Boyle must work with the United States Postal Inspection Service.

That partnership brings in Agent Jack Danger, played by Ed Helms. The episode’s title comes from the postal-investigation angle, while the Giggle Pig case supplies the police plot. Rosa’s focused leadership also contrasts with Jake’s frustration at having to cooperate with an outside agency.

Giggle Pig is a fictional Brooklyn Nine-Nine drug name. “Blue Sky” is associated with Breaking Bad’s fictional meth, while angel dust is a real name for PCP, so neither is the canonical answer here. “USPIS” aired on Fox on November 23, 2014.