A true-blue beat cop volunteers as Internal Affair’s snitch to root out an anonymous traitor when seized drugs surface in his cloistered community.

Agreed with, DPG and Gaerhart in the above comments.
It's hard to understand the concept from the logline, and the premise seems generic. I suggest you use personal stakes, character flaws and unique obstacles to make the premise more interesting.

"Cloistered community" ?What does that refer to? ?Cops do tend to bond with their brethren-in-blue ?and live in tight-knit social groups -- but for darn sure they don't work in cloistered communities.

And the theft of drugs being held in custody is a fairly common gimmick for kick starting a plot about corrupt cops -- from "Witness" (1985) ?to ?"American Gangster" (2007). ?I don't see any fresh take on that plot ploy in this logline.

"Cloistered community" ?What does that refer to? ?Cops do tend to bond with their brethren-in-blue ?and live in tight-knit social groups -- but for darn sure they don't work in cloistered communities.

And the theft of drugs being held in custody is a fairly common gimmick for kick starting a plot about corrupt cops -- from "Witness" (1985) ?to ?"American Gangster" (2007). ?I don't see any fresh take on that plot ploy in this logline.